Question about PC not booting or waking from sleep unless PSU is connected correctly.
Question about PC not booting or waking from sleep unless PSU is connected correctly.
Hello everyone,
I've encountered some problems over the last two days when trying to start my PC in the morning after it was either turned off overnight or left to sleep. When I attempt to power it on, I hear a click sound suggesting the PSU is trying to activate, but nothing happens—no fans spinning or lights illuminating. To fix this and get the PC running, I need to unplug the power cord from the PC, hold the power-on button for a few seconds (or simply walked away from it for a couple of minutes while unplugged, which also worked), then reconnect the power cable and press the button again. Once it boots up, everything runs smoothly without any sudden power drops or reduced performance.
This issue appeared suddenly two days ago, and I haven't made any hardware or software changes since then. Here are my specifications:
PSU: Corsair SF750W
Mobo: MSI MPG B650I Wifi
GPU: Radeon 7900XT
CPU: Ryzen 7800X3D
Ram: Corsair Vengeance DDR5 6000MHz 32GB (XMP enabled)
The motherboard, RAM, and PSU are all around one month old, while the GPU and CPU are only about three months old (I've replaced some parts of my system). If anyone has suggestions on what might be causing this problem, I'm open to trying different solutions.
Try a small experiment next time you shut it down for the night (you'll need to restart), go into BIOS and disable XMP to see if it helps.
I faced many power problems because of XMP on a B650 motherboard, so I ended up buying EXPO to fix the issue.
It was the simplest part to verify.
For a PC to keep supplying 5v continuously, and for the motherboard to interact properly with the power supply unit when you press the power button or enter sleep mode, the board must correctly communicate with the PSU. Once it does, the PSU will confirm the system is ready to start.
This suggests either the PSU isn’t functioning correctly, or the motherboard isn’t receiving the necessary signals.
Since timing is crucial, it’s more likely the motherboard has a firmware problem.
Other than replacing the motherboard, the only option I can suggest is updating the BIOS to a newer version (assuming you’re not already updated).
This might offer some improvement, though it’s probably the only viable solution I have.
If you had a spare PSU available, you could test it, but this seems impractical.
While testing XMP and similar features, I noticed the problem persists even without leaving it overnight. Restarting the computer seems to resolve it, but pressing the sleep or shutdown button on Windows causes issues. My BIOS is up to date. Since I don’t have a backup PSU or Mobo, I reached out to Corsair for advice. I’m also planning to swap my RAM sticks (I have spares) to check if that helps, and I hope unplugging and replugging the power connectors will fix it.