I recently purchased a used Z620 configured with the 2nd CPU riser, dual E5-2690, 32 Gbytes on each CPU for 64 GBytes total. 2011 Boot Block
The computer has been running great, but then I came back (was only out of my home office for a few minutes) to find a red power button and 4 beeps. PSU failure, according to the docs.
I did not smell any smoke and there are no visible burn/scorches I can detect.
I was able to get it up and running again by removing the 2nd CPU riser. With the riser out, it boots and runs fine. Zero issues apparent.
I have tried the following troubleshooting to get the computer to work with both processors:
* Vacuumed the dust off the riser,
* Reseated the memory
* Tried with no memory on the riser
* With fans disconnected and riser out, I get normal bios error messages
However, if the riser is in, the computer fails consistently with red power button and 4 beeps.
What are the best next steps for troubleshooting, and I have some ideas as I have a Z620 upgraded to Ivy Bridge (dual E5-2637v2 32 GBytes total) at work:
* Try my (failing?) PSU in my work computer,
* Try my (failing?) riser in my work computer (will E5-2637v2 vs E5-2690 be ok? Any risk to my work box from the riser?)
* Anything else to try with the riser?
* Any one have any thoughts on whether the PSU getting marginal or riser would be the more common failure?
* I already ordered a used PSU from eBay, basically on hope that it really is just the PSU getting tired.