Hi all, First off big thank to every one who responded on the last link. Having had two people look at the computer which would switch off with no warning I have replaced the motherboard however the problem is still occurring. I have now been told it is the PSU. So these are the facts off the box it is a socket 478 for pentium 4, P4i65G. Can anyone tell me a compatible PSU for it so I can go get one this weekend and kick son off my laptop! P.S. Not too technical please my extent of computer hardware is turning the computer on and opening up the case to clean it!