HP Z600 does not boot on 2 CPUs (full speed fans and no display)

[Basy1ysk]

Hello to everyone from Ukraine!

Recently I've bought HP Z600 workstation with 2x E5530 and 24GB of RAM.
Everything was booting up and working ok.

Yesterday there was a long blackout after Russian rocket-attack and I  decided to use that time and to upgrade the CPUs.
I've installed 2x X5570  instead of 2x E5530.
When the electricity revived - I've tapped the power on button, but PC was not booting. Black screen and all the fans maxing out(((((
I was not seeing any POST display and the computer is not indicating any BIOS errors, i.e. beeps or Power LED flashing.
I gave it time to initialize, but nothing happens.
I have returned 2x E5530, but the issue remain.
Right now PC boots up only with 1 processor installed (CPU1), and system see only 12GB of RAM out of 24GB.
I have tested all CPUs one-by-one and they are all working. But as soon as I install the second  CPU - I get full speed fan and no display.
I have tried pulling out CMOS batterry, resetting the CMOS, cleaned all the dust, checked all the wires and connectors, cleaned RAM pins with eraser - no result.

I'm in despair(((
What else can I do?

[SDH]

You may know that there are two boot block dates and two versions of the ZX00 workstations. Some v2 workstations were sent out from the factory with v1 55xx processor(s) due to those being less expensive way back when. Please check your BIOS and report the boot block date here... there are better faster 56xx processors you'd want to use if yours is actually a v2. This is different from the v1/v2/v3/v4 Xeon processors used in the ZX20/ZX40 next two generations of HP workstations.

Your X5570 is an approved processor for the Z600 v1 or v2.  Processors that can work in pairs need to have two "QPI links" and the X5570 does. However, rarely a QPI link in a processor can fail and in that case you can run each independently but not both as a pair. It is hard to sort out which one is bad. Can you return both? You've shown it is not an issue with your motherboard because you can go back to running both of your older processors when you wish... that means both of their QPI links are working fine.

We stand by here to help... and if yours is a v2 Z600 I have some specific advice to offer about best processors to get instead. Specifically you'd not want a pair of the hottest v2 processors because those would demand two of the rare expensive higher cooling capacity processor heatsinks.

[Basy1ysk]

The problem is that even 2x E5530 that was working on my motherboard and booting successfully are not working anymore.

As soon as I install second E5530 CPU - i get black screen and fans maxed out, not beeps, no red LED indication, only bnlack screen and fans going mad. It was working fine few days ago in double CPU mode, now it don't(((
P.S. I have v1

[SDH]

I'm sorry... I misread your first post too quickly.

I'd say you'll need to do a motherboard transplant if possible. Here in the US we have access to our local eBay and options likely are higher here. I'll post a bit more this morning (here) about how to tell the difference between a v1 or v2 motherboard. I can also suggest thinking about moving up to a ZX20 or better yet a ZX40 workstation. There is still a v1 vs v2 issue with the ZX20 workstations but not with the ZX40 ones.

Back to you shortly.

[SDH]

Below are some of the ways to differentiate between the v1 vs v2 Z600 motherboards. The key for getting a v2 from eBay or another source from which you can see the bar code label on the motherboard is that the far right side part number needs to end with -003. For the Z420 Z400 it was easier... the Z400 v2 has 6 memory sockets rather than the 4 present on the v1.

Be very clear with the seller about what you must have. Some use stock photos and may send you a v1 rather than a v2 by mistake. The packer has to get it right too.

The HP notice of the motherboard roll from v1 to v2 gives added info on what was changed. Of interest, the fastest server memory used in the ZX20 v2 workstations can also be used in the Z600 v2 due to a memory controller change so that is a way to buy very good fast 1866 MHz memory for your Z600v2 if you plan to later update to a v2 ZX20. That 1866 memory can only run at 1333 in the Z600 v2 workstations due to its other limitations.

Pics and PDF below:

[Basy1ysk]

Motherboard transplant is an obvious solution, but I still don't get what could have caused the issue, and I'm very curious about that...
I have carefuly checked the pins state on the socket.
I have checked all the CPUs in single-CPU mode, they are all working.
Also I checked if double-cpu mode is enabled in BIOS.
But it did not helped(((

[DGroves]

the fact that both single cpu's work, leads to the motherboard (bent socket pins in either socket)  most likely

as it's extremely unlikely that the qpi links in multiple cpu's have failed

as SDH mentioned a motherboard replacement is the best course or a newer system such as a used z240 minitower

or a lenovo p520 (or p520c) o ebay is worth considering if possible

looking at the posted cpu socket pict i do think i see a bent pin in the lower right area

from the right look at the fourth row in,    3rd pin from the bottom

[Basy1ysk]

Yes, it was the pin, I was fixing it before with a needle and a smartphone as a magnifier))))
My problem was that I was trying to fix the pin by making it perfectly align with other pins, but that did no result. Each time I was pulling CPU out - the pins where little bit bended to the left side. After several dozens of tries I decided to overbend the pin in an opposite way (right side), and after that I've managed to boot the PC with 2 CPUs.
Many thanks to everyone for help.