So...yeah. Earlier my computer froze and there was nothing I could do to wake it up again, so I had to turn it off. Now, when I try turning it back on, it refuses. The power button and the power indicator both light up, and I hear the whiring of the fan, but after that there's no other sign; the screen stays blank, with no backlight and not even a command line; totally blank, and it eventually goes silent again. I've tried putting the recovery disc in, both leaving it alone and pressing F11, that doesn't work either. Any ideas?