Yeahh.. I'd be suspicious of that too. The Xeon chip sounds like a possibility, but only a possibility. It's looking more like pSU or dodgy capacitor on the Mo'bo. They have similar failure modes to what you're describing. Although the fact it came back to life briefly makes me think that it could just be a poor solder joint acting up. If does prove to a problem with the motherboard, you could try stripping it down and gently heating it in the oven [oven tray with a sheet of foil to protect it]. At worst, all you've done is waste a bit of time and killed an already dying board, at best, it works.
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Yeahh.. I'd be suspicious of that too. The Xeon chip sounds like a possibility, but only a possibility. It's looking more like pSU or dodgy capacitor on the Mo'bo. They have similar failure modes to what you're describing. Although the fact it came back to life briefly makes me think that it could just be a poor solder joint acting up. If does prove to a problem with the motherboard, you could try stripping it down and gently heating it in the oven [oven tray with a sheet of foil to protect it]. At worst, all you've done is waste a bit of time and killed an already dying board, at best, it works.