Anubis probably made the most sensible comment so far... First port of call is to check the fuse. IIRC 5 amp should be enough (1Kw = ~4.1 amps). If you can take the side panel of your PC, you might want to try a new watch battery. My mates computer stopped working at it turned out to be this BIOS battery. Might also be worth a quick inspection of the power cables (to and from the power supply). Failing all that you could find someone willing to PAT test it for you (Although I doubt you'll know anyone with a tester or willing to help)
Make sure all wires leading to your motherboard and drives are securely clipped in. When trying the power you say you hear "electric shocks". I think this may be electricity building up normally and then dissapating through the earth. (This happens if you turn of your PC and then flip the power switch on the back then proceed to try and turn it back on). You should also notice the fan spin briefly.
/ 
