OK, I work in I.T so know enough But when it comes to your own pc maybe it's just me, but you fix pc's all day long and when your's develops a problem you just ignore it!

Basically from startup it seems my power supply unit is making a nasty noise (sounds like the fan) but it is deffo still turning, anyway by the time the o/s loads it stops (and yes the fan is still spinning ) I have cleaned out the PC, and can't see any problems, I guess it's new PSU time?...my next question is....where do you all buy your parts from? I am planning on building another PC and want to get hold of some cheap good spec bits