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PC failing to post, CPU led flashes red

The Sweetroll
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Hi,

 

I'm having an issue with my computer suddenly failing to even post while it worked perfectly fine two weeks ago. The computer (3570k, Asus P8Z77-v Pro,a titan GPU and custom WC) is mostly six years old with only minor changes to storage and cooling having been done, none of which recently. When trying to turn on the computer the fans power on for a second until the CPU led flashed red for a brief second and the PC tries to post again, this goes on indefinitely until you switch of the PSU. Only the power led is on otherwise and no video or any other signal goes through when turning on the PC. To fix the issue I've done the following:

 

- Changed video output to the integrated to rule out the GPU.

- Checked all connections and wires.

- Changes RAM slots and RAM stick around

- Cleared the CMOS

- Attached a CPU fan to the MB's connector if the lack of fan would have been the issue.

 

Has anyone had similar issues? I'm having difficulties locating the fault since the single red CPU led is so little to go by but the issue seems to be either CPU,MB or PSU related.

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You have obliviously tried basic troubleshooting.

But try to remove all except the CPU itself - GPU, RAM, HDD Etc.

If that changes anything, you can try reconnecting things one at a time.
One thing to look at would also be if the cpu is getting power.
So try removing all power connections, and give them a clean with compressed air and/or a old toothbrush, and also look for corrosion in the connectors.
Also, do you happen to have a spare PSU to test with?
 

CPU: 2x E5620 - GPU: 2x GTX660 - RAM: 64gb DDR3 ECC - Mobo: Z800 OEM - Storage:1TB WD Green - 256gb - Micron C400 250gb - 850 EVO - 512gb 850 PRO
Monitors: 3x HP ZR2440W - Keyboard: G710 MX Blue - Mouse: MX Master

Keep up the good tone and stay classyxD

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2 hours ago, pebble guy said:

You have obliviously tried basic troubleshooting.

But try to remove all except the CPU itself - GPU, RAM, HDD Etc.

If that changes anything, you can try reconnecting things one at a time.
One thing to look at would also be if the cpu is getting power.
So try removing all power connections, and give them a clean with compressed air and/or a old toothbrush, and also look for corrosion in the connectors.
Also, do you happen to have a spare PSU to test with?
 

Thanks for the fast reply.

 

I tried removing the HDD and all RAM which results in the PC staying on but of course not posting. No combination of my two RAM sticks and the four slots make any difference. The HDD being connected or not doesn't either make a difference. I can't easily remove the GPU because of the water cooling but using the integrated graphics doesn't change anything.

 

Could it really be a RAM issue or is it more probably a motherboard issue since two stick just dying seems a bit strange?

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  • 2 weeks later...

Sorry for not getting back to you.
Have you had any luck since?
I would sound like a bad board to me.

Did you test all components before mounting all the watercooling?

CPU: 2x E5620 - GPU: 2x GTX660 - RAM: 64gb DDR3 ECC - Mobo: Z800 OEM - Storage:1TB WD Green - 256gb - Micron C400 250gb - 850 EVO - 512gb 850 PRO
Monitors: 3x HP ZR2440W - Keyboard: G710 MX Blue - Mouse: MX Master

Keep up the good tone and stay classyxD

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