Last night i came home from class and try to boot up my computer, everything boot up fine denmy screen started showing multi colours! Alt-Ctrl-delete didnt work is i had 2 force shut down (holding Power Button)! When i tried to reboot, the power light comes on, but the activity light stays off! I get a faint fan spin and the screen stays blank! I tried using an external monitor bt no avail! Help any1!