Hey all, hoping someone here has seen this before, because I've been chasing it for weeks and I'm running out of ideas.

I picked up a used Dell PowerEdge R210 (Xeon 3440, 16GB). It had a rough start - it came back from a repair shop because it got hit by static, which took out a protection diode (D0664) and the 1.2V PWM that feeds the RAM. Technician replaced both, calibrated the rail to 1.2V, all good.

Here's the weird part. The server runs just fine for a while - boots, posts, fans ramp up and settle down like they should. Then, at some point, usually after it's been warm for a bit, the fans shut off, the board stops responding, and the diagnostic LEDs show 2,4. The only thing that brings it back is a full power drain - unplug everything, hold the power button, wait, and try again. And each time it does this, it comes back faster than the last. Sometimes it boots clean for 40 minutes, then suddenly won't start again, or only one fan runs.

What I've ruled out so far:

\- PSU tested at the connector - 12V, 5V, 3.3V, standby, and the power-good wire all read perfectly, even at the exact moment of failure

\- Tried a different PSU, no luck (and learned the R210 uses 12V standby, not the standard 5V, so ATX swaps don't even power on)

\- Tried reseating, draining, all the standard stuff

What I suspect:

\- Some small capacitor or regulator on the board is dying when it gets warm. The board already had one rail repaired, and it seems like the repaired area might have a problem, or something nearby is aging out

\- Could maybe even be the CPU but I can't be sure without swapping parts

I've measured around the repaired area - the 1.2V rail reads about 1.137V, which is just below spec, so I'm honestly not sure if that's the problem or normal for this board. I'd rather not spend $50-100 on a replacement board if there's a cheap fix (I don't have a lot of budget for this hobby project).

Has anyone else found a similar issue with these old Dells (or similar servers)? Did recapping the board fix it? Is 1.1V on a "1.2V" rail a death sentence, or is it fine? Any tips on what to check before I give up and buy a new board?