Computer starting up w/ fans then turning off. It does this on a loop until I turn it off from the PSU. CPU LED is red.

Toggle sidebar Toggle sidebar
E

Eaglestrike999

Reputable
Oct 15, 2014
4
0
4,510
I recently went to install my 2nd 760 to run SLI however I had a few problems with it not fitting. I undid the motherboard and put a few risers in and it solved the problem. Putting everything back together I started up my computer to find that all the fans started spinning, and then after a second they all stopped and it powered down. After a second or two it would try again and the same would happen on a loop until I turned it off from the PSU. When I looked into my case I noticed the motherboards CPU LED was red.

I have tried removing the second GPU assuming it was a power problem however that did not work. I then removed most of the parts one by one until only the CPU was left and it still has the same problem.

I have checked the CPU and it seems to be fine other than the fact it needs some thermal gel.


System Specs:
- NZXT Phantom Black Full-Sized Tower Case
- 2x (SLI) EVGA GTX 760 SC ACX 2GB GDDR5 Dual DVI HDMI DisplayPort PCI-E Graphics Card
- Intel Core i7 4770K 3.50GHz Socket 1150 8MB Cache Retail Boxed Processor
- Asus Z87-PRO Socket 1150 DVI HDMI DisplayPort 8 Channel Audio ATX Motherboard
- Seagate 1TB Barracuda 3.5" SATA-III Hard Drive - 7200RPM 64MB Cache
- Samsung 120GB SSD 840 EVO - SSD Only
- Be Quiet Pure Power L8 600W Fully Wired 80+ Bronze Power Supply
- Corsair Vengeance Performance Memory Module 8GB (1x8GB) DDR3 1600MHz Unbuffered CL9 DIMM Memory for 2nd and 3rd generation Intel Core systems


Any help is greatly appreciated as the only repair store where I am will charge me around £50 just to take a look at it!
 
Solution
nostall
Ya gotta go back to the start.
Power down completely, remove the second 760 and the risers: I don't know what you are using or where you place them but it appears something is grounding or shorting the board and/or the CPU - hence the red light.
Put it all back as you originally had it; Make certain nothing is touching the back side or the top surface of the mother board (especially anything metal or conductive) and that all your power connections are solidly plugged in and see if it will boot.
Re-post, please, and tell us what happened.
Quick Update: How did the second 760 "Not Fit"?
Sort by date Sort by votes
E

Eaglestrike999

Reputable
Oct 15, 2014
4
0
4,510
It doesn't even get to BIOS, it literally starts and powers down instantly, as for the RAM I don't think its a RAM issue as my stick works in my work desktop.

It could be a temperature issue as the thermal gel around the CPU is wearing a bit thin, is there a way to bypass this just to see if this is in fact the problem?
 
Upvote 0 Downvote
nostall

nostall

Splendid
Nov 28, 2012
3,244
12
23,865
Ya gotta go back to the start.
Power down completely, remove the second 760 and the risers: I don't know what you are using or where you place them but it appears something is grounding or shorting the board and/or the CPU - hence the red light.
Put it all back as you originally had it; Make certain nothing is touching the back side or the top surface of the mother board (especially anything metal or conductive) and that all your power connections are solidly plugged in and see if it will boot.
Re-post, please, and tell us what happened.
Quick Update: How did the second 760 "Not Fit"?
 
Upvote 0 Downvote
Solution
E

Eaglestrike999

Reputable
Oct 15, 2014
4
0
4,510
The board was slightly slanted, not bent, just slanted, so the first GPU that was higher up on the slanted board slotted in perfectly, for the second one I had to use a riser on the bottom left hand corner of the motherboard to make it fit as the GPU's metal bar that locks it in place on my case was getting caught before the GPU was fully inserted. The riser fixed this issue but I'm slightly worried that the fact the motherboard is slightly slanted in some places is causing the short circuit?

I have already checked for any screws I might have accidently left in and I'll take everything out and start again when I get back home from work and let you know what happens.
 
Upvote 0 Downvote
E

Eaglestrike999

Reputable
Oct 15, 2014
4
0
4,510


This worked perfectly, took the motherboard out and refitted it to make sure it wasn't slanted or bent and it now works perfectly. Must have been something causing it to short circuit like you said. Thanks a bunch mate!
 
Upvote 0 Downvote
nostall

nostall

Splendid
Nov 28, 2012
3,244
12
23,865


You are very welcome, glad you got it fixed: And welcome to Tom's!
 
Upvote 0 Downvote
B

bryanftc

Reputable
Dec 6, 2014
4
0
4,510


I just removed the ram completely from the computer and this time the fans did not shut off. Going to try all dim slots
 
Upvote 0 Downvote
P

parvs88

Reputable
Jan 16, 2015
1
0
4,510
Having same issue.
Comp stays on with no ram in (no display, post error 53) but with CPU led lit.
placed ram in A2 slot and still no display, comp repeatedly turns on and off
placed ram in other slots and no cycling, but still no display and dram led on have tried old ram and new ram, but no joy

Going to try ground up rebuild

Phew!
 
Upvote 0 Downvote
You must log in or register to reply here.

TRENDING THREADS

Latest posts

Moderators online

Share this page

COMPANY
RESOURCES
FOLLOW
Top Bottom