... or atleast thats what I think it is. I'm using 600mhx G3 iMac running 10.4.3, and in the past few week, it's started doing the strangest thing: it crashes. It doesnt hang or freeze, but completely and abruptly shuts its self down, almsot as if the power cord had been ripped from it's socket. Afterwards, the glowing power button light kind of flickers, and I can hear something (I assume it's the hardrive) spinning like a stuck CD. The computer will be running along fine, no real problems or slowness, and then this will happen, randomly and suddenly. It's been going on for a few weeks, like I said, but lately it's been happening more and more frequently. Since yesterday, it's happened 6 times! Also, I have noticed bizarre distortions in the monitor... a distorted, scratchy line will flicker across the screen of varying thickness and position. I'm terrified! I don't know what to do! Am I screwed? I love my iMac, please, please help me save it!