I have just upgraded our home computer with a new m/b, video card etc. and decided to build another system out of the "old" parts. These parts were all working together and I have basically re-assembled them in a new "used" case. When I turn the computer on, the lights on the keyboard flicker briefly and the HDD LED comes on but that is all. Nothing else appears to happen - well difficult to say that nothing is happening as there is no video display. I have tried different video cards and stripped it down to bare bones i.e. CPU, M/B, HDD and Video card but still no joy. Before I spend money on another M/B and CPU, is it possible the PSU is causing the problems. I didn't realise that the wattage played a major role but the PSU I have been trying to use is 255W. as I am at work currently, I am unable to check on the PSU of the case at home (which these components came from originally).
Any ideas would be gratefully appreciated