I have been given a pc to look at that is giving problems with booting up. When you power it up it the fans spin, the hard drive starts, the lights come on but after maybe 5 secs it then turns itself off. During this time there is no image on the screen and no beeps from the motherboard. So far I have fitted a different graphics card, it has onboard graphics, checked connections of ram, cables etc. I have also changed the Bios battery, all have made no difference to the problem. Tomorrow I will change the PSU incase that is the problem. Can anyone suggest what may be causing the problem or have I thought of the most likely reasons for the failure. It is quite an old pc, I have no idea what motherboard it is, there are no markings on it so I suspect it may be a PC Chips model.