My computer fails to start from any power-state other than power-off:
ASUS UEFI MB (F1A75-V Pro) with AMD Llano APU
12G RAM (passes memtest)
3x HDD
Thermaltake semi-passive PSU
Cold start works everytime, regardless if the PSU has been unplugged 20sec or a week.
The computer boots and runs mostly OK (some, but very few cases of freezing).If the computer is soft-off or hibernated:
Power-on, LED lights up, HDDs and fans start running.
In the moment POST should appear, the PSU turns off.
- It responds to power button, but every attempt ends the same.
- The built-in MB LEDs still glow, so the PSU is partially on.
- There are no warning beeps or blinking LEDs.
- It does not boot-cycle, it stays off.
- It responds to power button, but every attempt ends the same.
I unplug the power for ~20sec (until MB LEDs go out) and try to power-on.
UEFI halts during POST and writes "memory over-clocking failed, press F1".
I enter setup, save the same values which are already set and reboot.
Computer powers on, boots and runs.
This scenario is repeatable every time. Sometimes it also happens on reboot.
PC is fairly new, and this behavior appeared after a few weeks of use, one RAM failure and an APU fan/cooler upgrade.
When resuming from prolonged sleep/suspend, computer seemingly powers on,
but it halts and has to be unplugged – this started recently.
RAM is set either to SPD/JEDEC or EPP – it doesn't have any effect.
Originally there were 4 RAM blocks, but one died (random freezes, restarts and failing memtest).
I'm pretty sure neither the PSU nor the APU are overheating.
My guess is the PSU is dying, but it could be the RAM or MB as well.
Did anyone see this behavior before? Any ideas how to diagnose this?