Hi... After replacing my old Motherboard, CPU, Ram, Case and Power Supply with:- GIgabyte 8INXP Motherboard Intel Pentium 2.4Ghz Generic Case A 550W Power supply. (i dunno the make, i bought it at a Computer Fair supposedly "Good as Gold, Mate") I found that when i switch the computer on, all the lights come on the case, fans start whirring etc then it does one of several things (seems totally random) :- 1> Nothing happens, Screen stays blank, No Start Up Beep... 2> Bios starts up, then hangs after identifing the CPU... 3> Bios starts up, then hangs when looking for the Hard Drives and CD-Writers etc...(it finds some, not others) 4> Bios starts up, after 10 - 30 seconds looking for Drives etc, it continues to load Windows and everythings fine... 5> Everythings loads normally... After tearing my hair out and half the Computer, i thought it was probably the Power Supply. So i bought myself an ANTEC True Power 550W. Admittedly it has helped a little, now i only have a problem about 40% of the time, instead of 60%... I have also flashed the Bios to the latest version, as there was some problem with the Dual-phase Power System Daughterboard (on earlier Bios versions), but that hasnt helped... Im lost as to what it might be, but im edging towards its something to do with the power supply getting through, as the newer Power Supply did seem to help a bit... Any clues for the clueless???