Failure to POST - Absolutely no idea what's wrong!

Fumbles_22

Reputable
Jul 29, 2014
15
0
4,510
Hello,

I have been trying to figure out what's wrong with this computer for ages now. It's a fairly long story, so strap yourselves in!

About a year ago I built a really big computer system. It was fully watercooled (board, graphics card, CPU) and it ran incredibly well. Unfortunately, after about 5 months or so, something went wrong and it failed to POST. I ended up breaking that computer and selling the parts, since work changes meant that I didn't need anything that powerful anymore. The only parts I kept were the case and the PSU (an AX860).

After that, I tried to get a new build up and running. Here were the original components:

2400MHz RAM (Gskill or something)
7870k APU
Gigabyte F2A88X-D3H motherboard
AX 860 PSU
XIgmatek Elysium case

The two components I were reusing were the PSU and the case. I wasn't too worried about the case, but I was worried about the PSU. I had no idea what went wrong last time, so I bought a PSU tester:

tester_cm_24pin.jpg


to check if it was functioning properly. It said that my AX860 was functioning correctly, so I went ahead and used it in the above build.

Unfortunately, everything went wrong! It failed to POST, and no lights on the keyboard lit up. Since the only other component that had been carried across was the case, I thought I would test that. I took the motherboard out, connected it to the PSU on the kitchen table and fired everything up outside of the case. Hey presto, it worked!

This made me think that the case was the problem. I decided to buy a new one:

$_57.JPG


This is a Kolink Aviator case from ebay. It cost around £43.

I put everything in there. To be specific:

2400MHz RAM (Gskill or something)
7870k APU
Gigabyte F2A88X-D3H motherboard
AX 860 PSU
Kolink Aviator case

...and it still didn't POST.

By now I was really confused. The PSU was apparently fine, and all of the other components were new. I thought i'd bite the bullet and buy a new PSU and see if that would solve the problem.

New build:

2400MHz RAM (Gskill or something)
7870k APU
Gigabyte F2A88X-D3H motherboard
Corsair CX750M
Kolink Aviator case

Here are all of the photos without the side panels or front part on:

100_6890_zpspq80dun8.jpg


100_6896_zps1k3rx0mt.jpg


100_6895_zpsm2e08cl0.jpg


100_6894_zpsebjylmwi.jpg


100_6893_zpsvzph6yh7.jpg


So, this should definitely work! All of the components are new, there are no components from my old build that failed to POST, so this should be fine.

It still does not POST!! The lights from the fans come on, and it looks like it's thinking about it. Then all the lights turn off, and it sits there again.

Does anyone know why this might be happening? Can anyone suggest any other checks I could take?

Is it because I have a watercooling loop?
 
Solution
My gut feeling is that you have a shorting issue, either with the water cooling or the motherboard mounting.( This from someone who has never seen, and can not do hands on trouble shooting on, your installation.) Definitely try to get it working outside of your case. If this is successful( and you have left the cooling loop intact), then the issue would be how its mounted in the case.

Fumbles_22

Reputable
Jul 29, 2014
15
0
4,510


I looked at that post when I was having trouble before. It does a good job of breaking it down, and i've done many many of the steps before.

I just tried:

1). removing the front panel connectors, and powering it on using a screwdriver.
2). Resetting the CMOS
3). Doing what JSc posts ""Pull everything except the CPU and HSF. Boot. You should hear a series of long single beeps indicating memory problems. Silence here indicates, in probable order, a bad PSU, motherboard, or CPU - or a bad installation where something is shorting and shutting down the PSU."

I heard a lot of short single beeps, so my motherboard might be different. However, since I heard beeps, does this mean that my PSU, motherboard and CPU are fine?

If this is the case, then the problem has to do with short circuiting. I'll try taking the motherboard out of the case, and running it on cardboard.

Since I have a watercooling loop, would it be fine to just move the board away from the back of the case? I would have the board hanging from various wires, instead of touching something metal. It isn't ideal, but it would be much easier than draining the loop etc.
 
My gut feeling is that you have a shorting issue, either with the water cooling or the motherboard mounting.( This from someone who has never seen, and can not do hands on trouble shooting on, your installation.) Definitely try to get it working outside of your case. If this is successful( and you have left the cooling loop intact), then the issue would be how its mounted in the case.
 
Solution