My computer has often (but not always) completely shutoff during a cold boot process (towards the end of the Windows XP boot screen). When this happens I first need to boot in safe mode and then can ...

My desktop occasionally fails to shut down properly. It seems to complete Windows’ shutdown process, but then just freezes–without actually turning off. Pressing the power button accomplishes nothing.

I've got a PC that will hang on the Windows XP splash screen when it's "restarted". But if Shutdown cold and then powered on it boots up ok. Is there a way to troubleshoot this? PC is a new Intel H55 ...