I rarely turn off my main computer... It's a Dell 4600 w/ P4 2.8, 800 Mhz FSB, 512 MB RAM. Twice in the past few months when I have returned to the computer it does not respond. The screen is completely blank and there is no HDD activity, just fans... What would cause this? I have my power settings such that it NEVER goes into standby, and the HDD is NEVER supposed to be turned off... Upon holding the power button down to shut down and restart everything fine...I've done a chkdsk and there are no errors. I'm mainly concerned about lost unsaved data / IMs, etc... I'm not sure if there is anything more serious to be concerned about... Any ideas?