There was water spilled on my MacBook Air but I replaced the internal speakers. Now the sound is not working at all. No internal speaker or microphone is showing up and also the sound does not work with headphones plugged in. Tried reinstalling software, resetting NVRAM, and SMC. When running system_profiler SPAudioDataType I get Jakes-MacBook-Air:~ jakemacbook$ system_profiler SPAudioDataType  Audio:     Devices:  Does anyone have an idea of how to fix this or what I have to replace?
Sadly, yesterday I've spilled some water on my MacBook Pro (El Capitan). Before you yell at me - it was closed, turned off and it wasn't a lot of water, the laptop was wet only on the top and under - not inside.  Today I've turned him on. At first battery wasn't recharging for some reason, but SMC reset fixed the problem.  At the first booting speaker was like talking to me, hard to explain but it was weird. Also only right speaker was "talking", despite the fact that only left side of the laptop was watered. Then there was no sound at all, not from the speakers, nor from the headphones. Also microphone's not working. USB ports are okay. The water was spilled from the left side of the laptop. I know this is hardware issue, and something's broken, but I want to be 100% sure. No it's not muted. I've also tried NVRAM reset a few times, but it doesn't fix the problem :(  There might be one factor, before spilling, my laptop "died" for the first time (battery energy ran off), but I doubt it's the case. (but hey, every info matters, right?)  It wouldn't be weird for me, if only left speaker wouldn't work, but built-in microphone not working is kinda weird in this case, isn't it?  I just want to ask you guys, what else can I check, before I'll be 100% sure it's dead inside?  I've plugged in external microphone - it's not working too.
Сanonical form of a quadratic form by Lagrange's method This is just an eg. to understand how to solve it.  There is a quadratic form as below we need to bring to canonical form using Lagrange's method and find the coordinate transformation.   Then find the positive &amp; negative indexes, rank of the quadratic form. Finnally, to investigate sign-definiteness of the quadratic form by two ways: according to it's canonical form and the criterion of Sylvester: $4x_{1}^2+2x_{2}^2+10x_{3}^2-4x_{1}x_{2}-12x_{1}x_{3}-8x_{2}x_{3}$  Any clarification on how to do it are very welcomed. ISP blocking port 25 My ISP has started blocking port 25 so I can not send email through my dedicated server any more.   I have several options:   Send email through the SMTP server provided by my ISP. Any problems with this? Setup mu server so that it receives email on another port instead of port 25     No one else sends email through my server so it should be OK. How do I do this on a Linux server? Buy a static client IP - these are not being blocked so far.   Which one is preferable? Do the search engines take the number of 404 errors returned by a site into account when calculating the site rank? For example I have 8,000 404 errors and I am thinking that that's affecting my SEO in a negative way.  However, I read  about 404 errors which suggests that they are not always a negative quality indicator.   So I am confused...are high numbers of 404 errors harmful to a site or not? Get terms that contain posts that in turn belong to other terms? So I have custom taxonomy called "shape" and another one called "color". If I want to get the list terms under shape that contain posts that are also present in terms under color, how do I do that?   Example, I have a post under custom post type toy called Ball which is present in both shape Circle and color Red. I want to retrieve the term name Circle via $wpdb query. I'd like to emphasize that I want to retrieve the list of terms and not the posts. Eclipse error: "The import XXX cannot be resolved" What suggestions should I make when reviewing a poorly written paper? Since I need a break from the reviewing...  Often in my field I review papers from researchers in Asia (reviews are not double blind) which are poorly written. By poorly written, I don't mean that the prose is not pleasing to the eye, that there are problems with how the writing flows, or that there are innocuous typos or spelling mistakes. Instead, the grammar used by the authors differs seriously from normal English, and often produces significant changes in the meaning of sentences.  Usually such papers are ultimately readable, but one has to go back and re-read sentences or paragraphs several times to infer the meaning (and this is with strong knowledge of the research area!), so I generally won't reject a paper solely for this reason. However, I would feel remiss in my duties as a reviewer if I didn't instruct the authors to improve this aspect of the paper. I'd like to provide helpful advice for the authors without just giving them a laundry list of the errors.   Typically I highlight a few places where I had significant trouble understanding what they actually meant to say, and suggest seeking a professional editor before publication.   Are these reasonable things to suggest?   What other suggestions can I make? Why doesn't the Related question list show that questions are closed? I saw a question on Meta that was obviously going to be a duplicate:        And indeed, looking at the "Related" questions list for that question showed a number of duplicates:    Being the good citizen I am, I tried to vote to close (technically Flag as duplicate as I've not got the rep here to vote to close) it as an Exact Duplicate only to find myself falling into a rabbit hole of Closed, Duplicate questions. Is there any way to flag a closed question as such in the Related list?  Mostly because the first one I picked was closed as a duplicate of the second one, which was closed as a duplicate of the one that is now listed as the duplicate/linked answer.   Edit to respond to comment:  I take the point about "not voting to close on title alone", and normally wouldn't, however as the questions had identical titles, and it's pretty clear what they should be asking, I clicked the first one:    which lead to:  which leads to:  - but I'd got bored following links and didn't check that one as the first two were identical, so assumed this was too and didn't want to see how deep the rabbit hole led.   In the related list, there's only one other question in there that is an exact duplicate, but hasn't (currently) been closed as such which is:      Reasoning for highlighting closed questions:  The "Questions with similar titles" does display the closed titles when asking the question, so it should be fairly possible to include.  If there are clearly duplicate titles, then as a reader/reviewer would be helpful to know which ones are already closed as duplicates so you can either:   Use the remaining open questions to focus on which of those is the canonical answer to close this with. Use the closed questions to find the canonical answer (which failed for me with my route of clicks). Tips for getting latte or soda out of your keyboard? Finding a set of continuous functions with a certain property 2 I need help finding the set of continuous functions $f : \Bbb R \to \Bbb R$ such that for all $x \in \Bbb R$, the following integral converges:  $$\int_0^1 \frac {f(x+t) - f(x)} {t^2} \ \mathrm dt$$  I think it might be the set of constant functions but i havent been able to prove it :(   I was thinking that you can use the stone weiestrass theorem considering the set of continuous functions on a closed  interval(non trivial) ,and a subset which contains the set of continuous functions whose integral above diverges in some point in that interval along with  with the set of constant functions. So in order to solve the problem i need only to prove that if two functions do not meet the condition of the problem then their product does not as well .  I hope you can provide some insight and thank you . Infinite series $\sum _{n=2}^{\infty } \frac{1}{n \log (n)}$ $16$ rooks on a chess board. Place $8$ pairwise non-attacking white rooks and black rooks on a $8\times8$ chess board. If one can swap rows and columns, is it possible for the black rooks to take the initial position of the white rooks and vice versa?  My attempt:  Let the rows be $a_1,a_2,...,a_8$ and columns $b_1,b_2,...,b_8$. If there are white rooks at ($a_i$,$b_j$) and ($a_j$,$b_a$) as well as black rooks at ($a_i$,$b_i$) and ($a_j$,$b_j$), then we can reduce it to a $2\times2$ and a $6\times6$.   I don't know what to do next. Any help appreciated. Is taking the CUA (certified Usability analyst) certification worth it? I see a lot of people taking this  nowadays and I wonder if its actually worth it and how is it received by the industry and does it really help in bringing you up to speed with UX and usability best practices. Can anyone who has taken the exam before provide inputs on its benefits and also its cons if any.  I did see the question  and David's answer did mention that he found it useful but I would like to get more context in what sense people might find it useful and how it could potentially supplement or enhance a career. Let $D = B(0,1) \subset \mathbb{C} $ a disc, $f$ holomorphic on $D$. I want to demonstrate that if $$ 2|f^{'}(0)| = \sup_{z, w \in D} |f(z)-f(w)|$$  then $f$ is linear.   I know this is a well-known result. Where can I find the proof ? I am wondering why matrix factorization techniques in the machine learning domain almost always expect the provided matrix to be non-negative. What is the advantage of this constraint?  Background: I want to use matrix factorization algorithms for a sparse user-item matrix containing positive and negative implicit feedback. Is there any another possibility to set interactions with negative indications apart from fields that denote that no interaction happened between the user and the item? Using "align" instead of "array" in an array of equations Activate Rigid Body Physics at certain time? I've been trying to make a wrecking ball smash through a figure of sorts, not really sure what exactly but I made an example. The problem I'm having is that the figure does indeed fall apart, but I would like it to stay put together until the ball hits it. I achieved this by using Cell Fracture on the figure and just using Rigid Body. Again, I just need a way for the figure to stay still until hit by the ball, and then have all of its pieces come apart. Currently there is not enough space on by /boot partition/folder and the sofware update can not be performed.   Question: how should I correctly free-up some space in that directory?  Here is the listing:  root@mindaugas-ubuntu-14:/boot# ls -la total 156607 drwxr-xr-x  4 root root     3072 Kov 12 09:37 . drwxr-xr-x 24 root root     4096 Kov 23 23:36 .. -rw-r--r--  1 root root  1163858 Rgs  4  2014 abi-3.13.0-36-generic -rw-r--r--  1 root root  1164720 Grd 16 03:17 abi-3.13.0-44-generic -rw-r--r--  1 root root  1164967 Sau 13 22:12 abi-3.13.0-45-generic -rw-r--r--  1 root root  1164852 Kov 10 22:43 abi-3.13.0-46-generic -rw-r--r--  1 root root   165671 Rgs  4  2014 config-3.13.0-36-generic -rw-r--r--  1 root root   165748 Grd 16 03:17 config-3.13.0-44-generic -rw-r--r--  1 root root   165748 Sau 13 22:12 config-3.13.0-45-generic -rw-r--r--  1 root root   165748 Kov 10 22:43 config-3.13.0-46-generic drwxr-xr-x  5 root root     1024 Kov 12 09:37 grub -rw-r--r--  1 root root 29225220 Rgs 25  2014 initrd.img-3.13.0-36-generic -rw-r--r--  1 root root 29264463 Sau 24 20:22 initrd.img-3.13.0-44-generic -rw-r--r--  1 root root 29267419 Vas 23 20:30 initrd.img-3.13.0-45-generic -rw-r--r--  1 root root 29268175 Kov 12 09:37 initrd.img-3.13.0-46-generic drwx------  2 root root    12288 Rgs 14  2014 lost+found -rw-r--r--  1 root root   176500 Kov 12  2014 memtest86+.bin -rw-r--r--  1 root root   178176 Kov 12  2014 memtest86+.elf -rw-r--r--  1 root root   178680 Kov 12  2014 memtest86+_multiboot.bin -rw-------  1 root root  3386479 Rgs  4  2014 System.map-3.13.0-36-generic -rw-------  1 root root  3388834 Grd 16 03:17 System.map-3.13.0-44-generic -rw-------  1 root root  3389258 Sau 13 22:12 System.map-3.13.0-45-generic -rw-------  1 root root  3389458 Kov 10 22:43 System.map-3.13.0-46-generic -rw-------  1 root root  5806848 Rgs  4  2014 vmlinuz-3.13.0-36-generic -rw-------  1 root root  5814496 Grd 16 03:17 vmlinuz-3.13.0-44-generic -rw-------  1 root root  5814112 Sau 13 22:12 vmlinuz-3.13.0-45-generic -rw-------  1 root root  5814592 Kov 10 22:43 vmlinuz-3.13.0-46-generic   There was a mention of it here:      $ sudo apt-get remove linux-image-2.6.31-21-generic   but will it delete all the files? Accessing my Windows 7 files from my Ubuntu account I have just installed Ubuntu on my computer and I have windows 7 as my other operating system. is there a way that I can access my windows 7 files from my Ubuntu installation? Why can't root on one machine change nfs mounted content from another machine? On my NFS server, I have the following export defined:  #NFS exports Database /shared -alldirs -network=192.168.1 -mask=255.255.255.0   On my NFS client:  192.168.1.7:/shared /shared nfs rw 0 0   Obviously, as root on the server, I can do whatever I want.  On the client however, my regular user 'gabe' can make changes to the nfs mount (assuming I have permissions to), but root cannot.    As my regular user:   gabe@client$ cd /shared gabe@client$ ls -l total 8 drwxrwxrwx  4 gabe  wheel   512 Mar 20 19:20 tmp gabe@client$ cd tmp gabe@client$ touch test.txt gabe@client$ rm test.txt   As root:  # cd /shared/tmp # touch test.txt touch: test.txt: Permission denied   Again, this is all on the NFS client side of things, and I suspect perhaps it has something to do with the -maproot option.  This is the first time I'm setting up NFS and I just noticed this peculiarity.  I'm going to do some reading now, to see if I can figure this out, but if anyone has any insight, I would appreciate it. I've started trying to make a 3D model that I will end up exporting to an augmented reality app but I've hit a problem in terms of the particle system. The app wants the 3D file in .dae(collada) format which blender allows, but it doesn't seem to export particle systems. I've read that blender doesn't support exporting particle systems at all so I'm now focused on converting the particle system to lots of meshes which will (hopefully)animate using key frames. Then I can export all the meshes and the particles will 'work'.  Currently I'm just using a standard particle system emitting small icospheres. I've tried a few different techniques, such as 'make duplicates real' and using a particle instance instead but they don't seem to animate. Instead it just freezes the current frame into an object(which exports fine but is not what I want). I've also tried recording the animation in the blender game engine but particle systems don't work with it so that didn't work either.  Any help would be appreciated! Thanks