I have a pc-chips clone P4 motherboard (M930LR)with a 1.7.ghz celeron CPU. The problem is that more often than not when powering up, the pc will not boot. No error messages are displayed,just a blank screen, and then after 30 seconds or so, the PC powers down. I'm not sure wether it might be a power supply unit problem or possibly a video card problem. The video card is an SiS AG315E-32 AGP card. Eventually the PC will boot normally. Any help would be much appreciated.