I am not sure if this is a hardware or software issue but it has me puzzled, basically the computer will not reboot but halts part way into booting into windows, sometimes at the initial windows xp screen except the screen is very dark and faint, sometimes it just stops at a black screen. If I switch it off leave it for a bit and switch it back on again it will happily boot into windows and runs fine. Thinking it may be a windows problem I reformatted the new hard drive and reloaded windows but still the same problem. I have checked the memory and hard drive and as far as I can tell everything appears to be OK. This computer was originally given to me to replace the hard drive as the original one had failed although the pc would restart without a problem. Hopefully one of you guys has some words of wisdom for me.