I think my issue may be related to removing a USB thumbdrive without ejecting. Since doing so my system won't shut down or restart without using the power button. The screen fades to gray and they a Block of text appears in multiple languages telling me to hold down the power button until it shuts down. I've tried Utility disc and it finds no errors on the drive. I've tried the reset of the power by removing the plug and holding down the power button. Any other ideas?