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Intel D875PBZ not responding to power-on

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First post, by obobskivich

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So I was doing some testing tonight with my 875PBZ and a few graphics cards (should say - I was hoping to do...); got what I wanted with the FX 5900XT installed, switched to the 5800 Ultra, Windows had heart failure so I reformatted (it needed done anyways, I was hoping to cheat and do all of the "damage" to Windows on one install before dumping it into the sea - but no such luck) , installation is all AOK and away we go. The 5800U is in the middle of a killer 3D01 run (probably would've cleared 17000), when nVidia System Sentinel kicks in and ruins the party. It said the 5800 wasn't getting enough power (and dropped it down to 250MHz), and I figured "well, it's only drawing around 300W at the wall to give me a solid 350FPS, maybe the Thermaltake I use for testing isn't able to keep up with that..." so I popped the 500W Antec out of the system the 5800U came from and hooked it up, and the D875PBZ refuses to turn back on. Switch to the Corsair 520W from the QuadSLI system, system still refuses to power back on. Pull the 5800U and test it in the system it came from, it works just like it should.

There's no errors, no "start and die" etc the board simply refuses to start. I've cleared CMOS, reseated most stuff (tried with the 5800U out), etc and it just sits there. It shows power good with LEDs, the PSUs work, nothing blew up or popped or whatever, it just won't start. Any ideas? 😕

EDIT:

Thought of an easier way to explain what's happening: it's behaving like it was installed in a case with no standoffs and is shorted (this isn't the case, but it's basically the same symptom).

Reply 1 of 4, by pewpewpew

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Does sound like shorting.

Have you already unplugged everything non-essential. I'm thinking USB devices particularly. And if using USB kb mouse, swap them out temporarily.

EDIT - after that I'd start replacing things like the power switch.

Reply 2 of 4, by obobskivich

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pewpewpew wrote:

Does sound like shorting.

Have you already unplugged everything non-essential. I'm thinking USB devices particularly. And if using USB kb mouse, swap them out temporarily.

PS/2 KB and mouse, they work on the other 845 (the other P4/system) but I didn't try booting the 875 with them disconnected. Otherwise it has nothing non-essential installed, just the CPU, RAM, and graphics card - no network connection, no USB devices, no PCI cards. Swapped the 5800 for a TNT2 PCI and that didn't change anything. Tried unplugging fans from the board's headers and running them straight-up on the PSU, and that didn't change anything.

And it wasn't the switch - putting a screw-driver across PWR_ON also doesn't start it up (I know, I know, that's an awful way to start a machine - but it's a quick and dirty way to test a bad switch). And yes I even tried multiple, different, screw-drivers. 🤣 (which I did confirm working on another board 🤣)

Reply 3 of 4, by obobskivich

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So I'm thinking I should track down another 478 board and test the CPU there (I have other machines that can test the DDR RAM to confirm it works, same for the disks, the PSUs all seem to work, and the FX 5800 checked out in the 845 system, so it's just on the CPU and 875PBZ itself and I'm hoping all of the problems are in the board and not the CPU), but with that in mind: anyone have a suggestion/choice for a good 478 board? (that won't cost $100s used) Currently I'm looking at Abit VT7, and some Gigabyte mATX and ATX models from the "P4 Titan" era.

Reply 4 of 4, by Skyscraper

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If the board dosnt even try to power on a shot circuit seems likely or the board simply hates the PSU.

The short on canterwood boards are sadly often a burned VRM so check those.
Thermal paste in the CPU socket is another possible cause, try to reseat the CPU a couple of times or as a last resource wash the whole board with water and dishwashing liquid.

Bords that do power on often have experienced a bad bios flash if it isnt something more simple as memory incompatibilities.

New PC: i9 12900K @5GHz all cores @1.2v. MSI PRO Z690-A. 32GB DDR4 3600 CL14. 3070Ti.
Old PC: Dual Xeon X5690@4.6GHz, EVGA SR-2, 48GB DDR3R@2000MHz, Intel X25-M. GTX 980ti.
Older PC: K6-3+ 400@600MHz, PC-Chips M577, 256MB SDRAM, AWE64, Voodoo Banshee.

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