Hi guys I've got an iMac Late model 2006, running on 10.4. This morning I met the mac with a jammed black blank screen and the spinning rainbow wheel. I did a force restart and now the machine won't start up. I get chime and grey screen. What I've done: 1. Restart with no external devices like external HDs, printer etc 2. Reset the PRAM 3. Use the [old] original OSX disc with is 10.0.3, to attempt to get into disc utility - no luck, just folder with a question mark. 4. Use the apple hardware disc - folder with question mark 5. I can't access the single user mode (Im not sure if I had set the password or not ) IT just stays as blank grey screen 6. Nothing but grey screen when trying to manually open firmware I really don't want to just replace the HD or take it to a tech - it's a work machine, is there any other option I have?