about a week ago, out of the blue, my video monitor went black. i know it had been a while since i blew out any dust so i blue out the inside of my mirror-faced G4 with some canned air. it was dusty, but not gross. anyway, i hooked it back up and it worked. today it did it again. i thought maybe it was the monitor so i unplugged it from the computer to see if i could get the monitor's own menu to come up on it's own which would tell me that the computer was the problem. the menu wouldn't come up, but "no signal" was flashing on the screen while it was disconnected from the G4. i did a hard shut down and hooked the monitor back up, and it works again. seems to me it is the computer. should i plan on buying a new video card? i didn't know video cards could die slowly. i'm assuming that's what's happening here. anyone agree? disagree?