this has just started happening, when i switch pc on i sometimes get a screen freezeup, and takes up to 3 restarts, did a virus/spyware scan in safemode and that was ok, doesnt seem to be any overheating probs. im at a loss now, is it possible its my wireless adapter as i have just moved it from 1 usb to another. im running win7 on a homebuild pc. i have 2 dvd drives connected. PS: forgot to add that when i hit restart button not the on/off switch i get message "windows failed to shut down properly how would you like to restart windows" now i thought you got that message on shutdown or reboot options.