I came home yesterday and found my monitor in standby mode even though my mac pro was on. Moved the mouse and nothing happened. I thought it was the monitor and decided to do a hard restart. The computer turns on - the power light and fans do at least - but there is no 'dong'. Any ideas of what could have happened, why, and how to fix this? The computer is an early 2008 dual quad core, with an 8800gt. First time something like this has ever happened. Thanks for any help.