Daughters PC getting no power at all. Turn it on nothing happens (no lights, no fans, no fans in power unit). At first assumed power unit had gone, but replaced this and exactly same. What else is likely to have gone? - If motherboard or memory fails would there be no power at all. I would sort of expected the PSU itself to do something -Urgent advice appreciated. Thanks
Motherboard would be my guess. Just do not understand why no fan on PSU, that is before you get to the mobo. Can't see it being the processor though, unless at a previous boot the processor fan did not work. Possibly a duff PSU? - have you tried it independently on a known working cable from a different socket? Fan should start.
This PC was working fine, but is about 5 years old - When it stopped working I bought a new PSU but getting exactly the same result (nothing)- Can't really try the psu on anything else but chances of two PSU being duff must be remote. If the motherbaord did fial I wonder whther it wouldn't create a circuit and therefore no power to PSU?
It's highly unlikely that a faulty CPU would cause this problem but the mother board could. When you press the front panel ON buton it sends a logic signal via the mother board to the PSU to switch on. If there's a break in this path then nothing would happen. Check that the cable from the ON button to the mother board is OK and connected, and that the ON button is actually working. Having already replaced the PSU it's unlikely that the fault is with the Mother board/PSU connector. Note that even when not switched on, as long as AC power is connected there is a voltage on the mother board. This, among other things, allows the power-up sequence to start. That how it works on my Asus mother board. I suppose other boards are much the same.
Sorted this - posting as it may be useful to others - It wasn't the power supply. I unplugged all the drives and peripherals in the case auntil just main power header and it started Ok. Plugged them all in again and still worked. Best guess is one wasn't properly connected and was stopping PSU from running
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