What part is broken; CPU, motherboard or PSU?

Matzi

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May 11, 2014
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UPVOTE, BEST ANSWER AND BIG HUGS WILL BE AWARDED IF YOU CAN HELP ME OUT WITH THIS!!

Spec:
Motherboard ASUS M4A89TD
CPU Uncertain, as I can not check, but it's a AM3 socket 6 core. I am pretty sure it is an AMD Phenom ii x6 if my memory serves me right.

So I've had issues for a long while with my computer every once in a while entering "sleep", as in screen suddenly goes black, but the fans etc. are still running. When I tried to reboot it would not boot, and the CPU led was red. How I fixed this was by removing the cable from the powersupply to the motherboard, and eject the BIOS battery. This usually fixed it on the first try, but sometimes I had to do this a couple of times before it actually worked. I never really understood the deal with that, but I would immagine it was either something wrong with the motherboard, or some components running too hot. ( I have a GTX 480 that gets really hot, like 80-90C however this is normal for that card ).

Recently I got myself a water cooler for the CPU to mitigate some of the heating, but when I tried to detatch the cooling grid, it had stuck to the CPU due to excessive amounts of thermal paste, and I ended up just pulling the whole thing off, obviously without being able to flip the "CPU socket lever". I folded up a piece of paper and used it to slide the CPU off the cooling grid, at which point the CPU fell to the floor. I straightened out a couple of bent pins, and removed some thermal paste that had ended up in between the pins with a toothbrush. I reassembled everything and tried to boot, just to see the CPU led glowing and no boot. At this point my friend told me that it looked like it wasn't getting enough power, so he unplugged a cabinet fan and voila! it booted! ... And stayed alive for some hours before the black screen problem I mentioned in the first paragraph suddenly showed up again and ruined my evening. I've not been able to fix this with any of the aforementioned methods, which leads me to think that something is broken "duh!". The problem is what!? Is it the motherboard? Is it the PSU? Is it the CPU? Heeeelp! =(

Things I have tried:
Removing BIOS battery
Bare bones it with 1 RAM DIMM
 
Solution
1. Re-seat the video card in the PCIe slot if you have not already done so, and blow out the slot while you are at it.
2. Try a different video card or PSU, whichever is easiest to replace with a part on hand.. If the first test fails to identify the culprit then try the other.
3. I lean strongly toward PSU having a partial/intermittent issue.
1. Re-seat the video card in the PCIe slot if you have not already done so, and blow out the slot while you are at it.
2. Try a different video card or PSU, whichever is easiest to replace with a part on hand.. If the first test fails to identify the culprit then try the other.
3. I lean strongly toward PSU having a partial/intermittent issue.
 
Solution

Matzi

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May 11, 2014
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Don't have any at hand right now, but I've made a post about it on Face.. Hopefully someone will help me out. Would it be possible to check if the PSU is broken with a multimeter?
 


Yes you can I suggest following a guide. Here is one http://pcsupport.about.com/od/toolsofthetrade/ht/power-supply-test-multimeter.htm lots of youtube videos too.

Only problem is if your problem is intermittent or only happens under load then it may not show up on the test.

 

Matzi

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May 11, 2014
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4,510
Thank you very much for the effort! To my great surprise, I discovered that we are given 5 years of warranty on computer parts by law here in Norway, so hopefully that will take care of what ever problems there is. Also, this thread strengthens my/our concerns towards the PSU. Some guy had the same problem, and another guy had it replicated. http://forum.corsair.com/v3/showthread.php?t=114765

By the way; would you rule out the possibility of the CPU being the problem?
 


CPUs virtually never go bad so I would rule that out except as a last, last, last resort.

EDIT: re-read the original post and since you did drop the CPU and fiddled with the pins I guess it could possibly be suspect. But you had this problem before doing that. I'm still very much in favor of blaming the PSU but keep an open mind, you just never know until you test.
 

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