Computer starts briefly, then powers down and won't restart
Computer starts briefly, then powers down and won't restart
I understand that point, your main choice now is breadboarding. Take out all components from the case and just link the PSU to the motherboard. Observe the outcome. If it remains active, switch it off and retry after adding another part, continuing this process until it fails or you reach a complete configuration. If everything functions outside the case, you've found the solution. You might also ask a friend to bring another machine to your location and power it on. If it exhibits the same problem, it clearly indicates an electrical issue.
I connected the PSU outside the case and started the computer without memory. It seems to be working well for the past hour. I’m wondering if the PSU inside the case or the memory might be the issue, even though I remember trying without memory and it stopped. I plan to leave it on overnight and check again tomorrow. 4090 and all SATA devices are unplugged, otherwise everything is ready.
The PSU hanging out of the case isn't giving me confidence. I looked into Nvidia and they say the minimum PSU for a 4090 is 850 watts. But as it seems, bigger is better in this situation. The 4090 is a powerful machine and you really need to provide enough power. It's like using 85 octane gas in a Ferrari—it's not ideal. Did it essentially stop working after about an hour this time?
I'm hoping everything else is still fine. Please keep us updated.
PSU was not inside the case anymore (I’ve been properly mounted until that attempt), which makes me think the mount screws or position might be the problem. I’m really worried. Also, I changed the 4090 to a small old AMD card this time. I don’t know when it stopped working. I went out to cook and did other things and came back to find it wasn’t running.
Later today I plan to retrieve my old desktop and experiment with swapping PSUs between the two units to observe any differences. I’ll also try “breadboarding” as another suggestion. If that approach succeeds, I might assume the issue lies with the case itself and simply swap the cases, accepting it as a satisfactory solution. The other desktop uses a modular 850W Corsair PSU that has worked well for years. I tested the original PSU from my first case with this new setup—it appears to be completely dead now…
Also, don’t worry about this; it will use the 4090 swapped for a small AMD card from around 2016, and I’m not sure of its exact model. I also have an old NVIDIA quadro card that could be tested.
I calculated the total TDP from the CPU, GPU, motherboard, and estimated memory, storage, and peripherals, which came to about 850 watts. That means a 1000-watt supply should work with the 85% rule (assuming the system runs). If problems arise, I’ll upgrade to a 1200-watt unit.
I think the MSI power supply might be faulty. I replaced it with a Corsair 750 watt unit (not the old one I damaged during setup) and it has been functioning properly for an hour using a 1060 instead of a 4090. Windows was installed without any problems. However, it could still crash unexpectedly, so please keep the thread open until further notice.
I noticed Nvidia lists 850 as the minimum for the 4090.Since it requires a lot of power, it makes sense to upgrade to a 1000 watt PSU. If that doesn’t work with a proper 1000 watt unit, a 1200 watt one will be wasted. At this stage, power consumption isn’t the main concern.
And honestly, I’m not familiar with undervoltage damage, so... (?) I’ll try using a 1000 watt PSU and follow the breadboarding steps. If I encounter any issues, I’ll let you know.