Long story short, my oldie MBP 2011' battery started bloating, I've contacted a repair service center and they advised me to remove the battery and use it on AC power, while they get a new battery for a replacement. What I've noticed a few days back, that my MBP starts extremely lagging from time to time. After a restart, it works fine for 12 - 20 hours and then the problem appears again. I've noticed that when the lagging starts, kernel_task begins consuming up to 500% CPU. So I bet that the problem's source is kernel_task, but what causes its extreme rise? Could it be a removed battery?
88240
I'm trying to solve the mystery of a crazy high cpu usage on kernel_task.  MacBook Pro (Retina, Mid 2012), 2.7 GHz Intel Core i7, Yosemite 10.10.2  I saw some advice to download the Intel Power Gadget. That showed me that the my CPU is slowing way down. How do I fix this? When this happens, I can sometimes cycle the power on the MBP. But this is driving me crazy.
115506
I have a MacBook Pro (15-inch, Early 2008) that's currently running 10.7.3. I've been finding that it will intermittently freeze and then I have to shut down and restart the computer, but sometimes that will not fix the problem.  If I plug in an external mouse and keyboard, then I can move the cursor and type again, but as soon as I remove them, the problem persists.  I've tried resetting the P-RAM, reinstalling Lion, installing a new HD, and I've had the graphics chip tested and it's performing properly. If you have any suggestions on how to fix or diagnose, that would be very helpful. Thank you.
30973
I see that the question &quot;why is my MacBook not charging?&quot; gets asked a lot. The problem is, there are multiple reasons. Possible points of failure are: charger, cable, magsafe connector, DC input board, logic board, battery. (Have I missed any?). What is the best sequence for a user to follow, to diagnose the problem? By way of example, here are the first steps that I usually try:  Make sure the charger is working. Either use your charger on a different Mac, or test a spare charger with your Mac.  Check the connection. There might be gunk in your port that's stopping the connector from lying flat.  Try resetting the SMC and PRAM.  If the computer boots, run Coconut Battery to determine battery status.   This is where I get a bit stuck. For example, I have a machine here that boots fine when plugged in, but not from battery. Disconnecting the MagSafe causes the machine to switch off. Sounds like it's a dead battery, except that Coconut reports the battery as detected, in good condition, but not charging. What steps should I take next? Specifically, I'm asking for a generic algorithm to help determine the source of the fault (preferably without swapping out lots of components one by one)?
4239
I've not used dd all that much, but so far it's not failed me yet. Right now, I've had a dd going for over 12 hours - I'm writing an image back to the disk it came from - and I'm getting a little worried, as I was able to dd from the disk to the image in about 7 hours.   I'm running OSX 10.6.6 on a MacBook with a Core 2 Duo at 2.1ghz/core with 4gb RAM. I'm reading from a .dmg on a 7200rpm hard drive (the boot drive), and I'm writing to a 7200rpm drive connected over a SATA-to-USB connector. I left the blocksize at default, and the image is about 160gb.  EDIT: And, after 14 hours of pure stress, the dd worked perfectly after all. Next time, though, I'm going to run it through pv and track it with strace. Thanks to everyone for all your help.
13777
I am sure many of you guys know the flashing folder icon which shows up when the Mac cannot find a drive to boot from. My 2017 MacBook Pro has this issue for some time now, but recently I found something interesting.   The MBP won't find the boot drive, as long as the battery level is at > 70%.   The Mac boots just fine at lower battery levels; no issues whatsoever. Now, the problem is, I don't want to run my MacBook via battery the whole time or keep on disconnecting the AC power when 70% is reached every time.   Does anybody have similar symptoms and did find a better solution? Do you think there is a hardware issue with my device?   I've been to the Apple store before (when I didn't knew this was connected to the battery level) and they couldn't find anything. They suggested I reinstall macOS, which of cause didn't change anything.  Edit: One detail I forgot to mention was that when I charge my MBP and close the lid, it crashes and gets really hot (fans turn on slowly). I'm not totally sure on this, but I think this also happens with lower battery levels.  Battery Info:
2655
My MacBook Pro 11,2 (Retina 2014) shuts down suddenly from time to time. When I run macbook again, I inspect the log file I see the following message:      Previous shutdown cause: -128   Sometime, when I close a laptop, fans begin to hard work. It happens with/without power adapter. I launched Diagnostic and I got 'NO ISSUE'.   When I run macbook in SafeBoot, all work correctly, but very slowly.  I tried:   Reset SMC, PRAM. ERASE Disk and install macOS from scratch.   Also, I tried to remove battery and use the power adapter only. In this case it work correctly, but sometime I get another error (It happens rarely).   Macbook pro 11,2 Retina 2014 (15 Display) Intel Core i7 2,2 GHz RAM 16 GB SSD 256 GB
53625
Model: MacBook Pro Retina, 13-inch, Early 2015 While I was working, I didn't realize that the battery was low and as a result, my MacBook Pro shut down when the battery had no power. So, then I plugged in the charger and powered it on. This time I noticed something was strange. The battery was stuck in 0% for like around 10 minutes and the date got reset to 1st January 2017. I tried resetting NVRAM. Nothing happened. So, then I ran diagnostics and I got this as a result:  Here's the battery information:  Here's a screenshot from Battery Health:  Now it is pretty obvious that you might ask me to change the battery because the screenshots say so, but I want a final opinion from you guys what to do next. Everything was working fine and all of a sudden this happens. I feel if I plugged the charger in time, I wouldn't have to see all this. And also a new battery isn't exactly affordable for me at the moment. And it is also important to note that while the charger is on, it shows orange LED. So, what should I do?
75855
I am currently using a macbook pro but the operating system is debian 8.2 not os x  I am using a macbook pro but there's this one device that's just draining a lot of power. This USB device: Card Reader (Apple)   32.5 W    100.0%                      Device         USB device: Card Reader (Apple)   2.60 W    100.0%                      Device         Radio device: btusb   209 mW     19.7 pkts/s                Device         Network interface: wlan0 (wl)   This device really drains my battery, I noticed that my laptop wouldn't even get 2 hours when not plugged in, I installed powertop. Made all the recommended changes but this device, I can't find out how to disable it. I don't even use that reader and forgot that it was there.  I configured all my devices to use limited power in my rc.local  echo '0' &gt; '/proc/sys/kernel/nmi_watchdog' echo 'min_power' &gt; '/sys/class/scsi_host/host0/link_power_management_policy' echo '1' &gt; '/sys/module/snd_hda_intel/parameters/power_save' echo '1500' &gt; '/proc/sys/vm/dirty_writeback_centisecs' echo 'auto' &gt; '/sys/bus/usb/devices/2-4/power/control' echo 'auto' &gt; '/sys/bus/usb/devices/1-12/power/control' echo 'auto' &gt; '/sys/bus/usb/devices/1-8.3/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:00:1f.3/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:01:00.1/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:00:1c.3/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:00:1c.4/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:00:1c.2/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:00:1c.0/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:00:1b.0/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:00:16.0/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:00:14.0/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:00:01.1/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:00:01.0/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:00:00.0/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:01:00.0/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:08:00.0/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:07:06.0/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:07:05.0/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:07:04.0/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:07:03.0/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:07:00.0/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:06:00.0/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:05:00.0/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:04:00.0/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:03:00.0/power/control' echo 'auto' &gt; '/sys/bus/pci/devices/0000:00:1f.0/power/control'   How can I get this device to act sanely or disable it completely because I  haven't used it.
107128
My laptop is capable of running most games on high settings at decent frame rates. However, if the power cable gets unplugged while I'm playing, the game immediately starts slowing down, even if I'm using the High Performance power plan.  Why does this happen? Is the battery not able to keep up with the power demands of the GPU? Is there any way to fix this?
45657
I have Macbook Air, Mac OS X El Capitan.  There is no warning box shown before the battery is near %15, like it did for Mountain Lion. So I can not notice and my computer goes sleep simply when the battery is off.  And even if it did I generally miss it because I use it external monitor attached to my Macbook Air. And because I play Spotify, I may miss the warning sound, too.  Is there warning box for low battery on El Capitan? If not, is there any utility or software that may help for external monitors and even playing music?
83095
This discovery came after my latest question:   I use my macbook on a stand with good airflow, after High Sierra, I noticed unusual high heating along with poor gpu performance, afterwards I noticed screen damage, and now, I discovered that my macbook is physically swollen, 2-3mm's I'm guessing  The issues could be unrelated to High Sierra, yet, it would be too big of a coincidence if it's not the cause, as things were breezy beforehand  Here's a picture of the issue:     The trackpad area is swollen, the trackpad doesn't click any more, the battery reports "Normal" condition (Cycle count: 12), the lid doesn't close any more, but everything luckily works for now  I assume it's the battery that's swollen, but even with the high heating I complain about, the GPU temperatures was 80C at most and enclosure temps weren't extremely high  It's a shocking issue for me, I'm wondering whether there is a solution other than buying a new Macbook, unsure how to approach the issue in general, and since I use the device daily, really don't want to part with it even for repairs or inspection, I'm located in Turkey  Also curious why I experienced these issues with High Sierra and whether anyone else has similar experiences
92207
I have just installed the macOS Catalina 10.15.5 update on my 11" Mid 2013 MacBook Air. The update is working fine.  The MacBook Air specifications on the Wikipedia page says that this model has a lithium-ion battery, 'tho I haven't unscrewed the case to look. But the new Battery Health controls in System Preferences → Energy Saver don't appear.  Not a lithium-ion battery? Or perhaps other differences in this model prevent Battery Health from showing up? Something else?
119016
I noticed that my MacBook Pro 5,5 middle 2009 is very slow so i thought i had some malicious software in it but today i went to check something about the hardware in the computer under "About this Mac" and i noticed that i only had 2gb RAM which is wrong because i have 2 RAM memories of 2GB each. So i opened the laptop and started trying some stuff. I removed one of them and the computer didn't even start i just got a beeping sound. But when changed the memory to the other RAM Slot the computer started with 2GB RAM as always and in conclusion both RAM memories are fine. It seems that one of the memory slots is fried. Only way i found to check if one of the slots is broken was to do a memtest so i ran the command memtest all but i got no errors and the system didn't freeze. The question is: how could i see if the RAM Slot is broken besides doing this memtest?  Additional info: in december i put the laptop to charge at work, after an hour or two i noticed that the laptop was so hot that i almost couldn't even grab it, i could fry eggs on it. But nothing else happended it was working as usual. Maybe that's the reason why this is happening. So once again, how could i check if the memory slot is broken and in case it is how could i fix it?
71056
I have a mid 2009 MBP which was heating up way to fast because of the fan; then I bought a new one and changed it. I also applied a new thermal grease. Plugged all the cables, tightened all the screws, reset SMC, reset NVRAM and turned on.  The heat is gone and its running perfectly now, but:   the display started showing some "blurry ghosts" at the bottom of the screen which won't show if I take a screenshot, so I took a photo that you can see below.      the keyboard backlight isn't turning on. I tried to unplug and plug the cable over and over again, but nothing happened. the camera isn't working at all. All I see is a black screen.    Is there anything I can do to fix any of these issues?
40805
I've read a bunch of forum posts about the Android OS battery drain bug. This is where the 'Android OS' process is showing large percentages in the battery statistics.  For me, I'm running 2.3 Gingerbread. I don't use bluetooth or GPS. I'm on 2G most of the time. Some days I get 40 hours out of a battery. On these days in the battery usage settings, the 'Android OS' process uses about 3% of battery. However other days I get about 8 hours with similar use. On these days the 'Android OS' process uses about 35% of the battery. I really want to find out what causes this.  The fixes suggested so far are:   Reboot (Temporary). Turn off and remove battery for a couple of minutes. Reset battery stats. Change WIFI sleep policy. Use a task manager Flash stuff to the phone. Revert to older versions of the OS (not really a fix).   Does anyone know the definitive cause of this problem and the correct fix? Or is it possible there are multiple issues that cause this so different things will work for different people?  Here are some of the threads:
59166
Recently my Macbook Pro Retina Late 2013 has started to shut down unexpectedly while running on battery. I thought it was because of my CPU was too hot but it was not the case. When checking it further, I found that my battery status is "Service Battery". I used coconutBattery to check and found that the Full Charge Capacity of my Mac is insanely low. I could be sure that it was around 90% last week and suddenly now it dropped to 46.9% of the Design Capacity.    I tried resetting SMC like many other said but unfortunately, it did not work for me. One symptom I saw before having this issue is that my Macbook temperature was quite high. I could feel the obvious difference in temperature between my Macbook and others' at the office when touching my hand on it, I guess my Mac was about 10 degree Celsius higher than others.  Is anyone here had this issue before? Should I replace my battery completely? Is it possible to replace the battery only on this Mac, I think it is nonremovable?
110320
I haven't found anything yet so I was hoping maybe someone here had an idea.  I want to kick off an even based on battery on an Apple laptop reaching a certain charge level, or when the battery is fully charged.  I know I can have something run periodically, check the battery level, and decide what to do, but I prefer event driven if possible.