Ok, I was reformatting the hard drive on my Amiga 4000 when all of a sudden it stopped. The screen went dark grey and the hard drive LED goes on and off, on and off. It also sounds like the hard drive is running at different speeds. I tried hooking up different hard drives, same thing.
I am scratching my head on this one. 
Yep,i third that motion! check the psu...
