System turned off then wouldnt power on

On 15/05/2023 at 11:35, xMorpheousx416 said:

* I had a thermistor go bad in one power supply, and the fan wouldn't kick on when under load.. you could smell it getting hot and that was the only indicator to let things cool down. I ended up putting a different fan in it, and plugged that fan directly into the motherboard headers and let it run full speed.

Power supplies are, or were, thermally controlled by a thermistor that's kinda glued to the largest heatsink. Just like there's a thermistor in the vents of AC units to control when to shut the machine off when the room cools down to a certain degree.

On 16/05/2023 at 07:59, neufuse said:

Well it may be my graphics card.... 

moved it to another system that has a 1000 watt psu... ran the same CUDA computations and boom it went off too same issue, computer would not turn back on, tried something different, pulled the GPU when it wouldnt turn on and boom it came on... let the GPU sit out then put back in and it worked again

That's what's nice about having spare parts. You can do a quick swap, test, and see which component is causing the issue. I find it interesting that neither computer will power on once the card fails... as usually, you'll see fans turn on, maybe hear that typical beep as it powers up (if you have that piezo speaker attached) but you won't see anything on the screen. Seems whatever is overheating in the card, shorts to ground(?).. but cools off quickly enough to power on after a few mins.*

I'm also questioning these Cuda calculations... what is it that you're running that's scaring the crap out of the GPU?

* Back in the Vista days, HP had released a series of laptops that, for some reason, in manufacturing.. they used a lead based solder instead of silver.. and the connection points between the GPU and the board, would melt under high heat causing a massive short. Spent a good amount of my time as their tech replacing said machines.

Well, at least we were able to help narrow down which component was having the issue.

I try to always keep a spare PSU around.  That's the most common issue I have had personally.  Glad you got it figured out, though.  If you can get a new card, I would definitely do that.  There might be a way to fix the issue, but ultimately, if you can use the performance uplift, it's worth it in the end.