> I'm having problems with my computer again. (Writing from another one.)
>
> When I press the ON button, nothing happens at all. Does it have power? 
> Yes - the little green LED on the motherboard is lit just fine. I just 
> can't turn the thing on...!
>
> Any suggestions what to do, or even just finding out in which part of the 
> computer the problem lies?
> (Remember that I am totally clueless when it comes to hardware...)

As Warp said, likely the PSU, or just the On switch has broken/disconnected. 
You're going to have to get inside the PC to diagnose the problem further.

Step 1 : Unplug the big connector that goes onto the mainboard from the PSU. 
It will have 20 or 30 small cables going into it all different colours. 
Once unplugged, look for the green one (there should only be one, pin 14 
IIRC) and then find a black one (probably more than one).  With power 
disconnected, insert a paper-clip (or a bit of wire) into the socket where 
the green and black cables are, thus joining them together.  Then turn on 
the mains, the PSU should spin-up.  If it doesn't get a new PSU.

2) If the PSU is working ok then next check the On switch is working.  Look 
where the on switch is connected to the mainboard (usually in the bottom 
corner somewhere) and unplug it.  Try jumping the two connectors on the 
mainboard with a paper-clip again.  If the computer works then you have a 
problem with the On switch.  If it doesn't then you have a problem with the 
motherboard.  You could then try forcing the PSU to start by jumping the 
green and black wires as in step 1) while it is connected to the mainboard.

Of course you could just unplug and plug in everything to make sure first.

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