IMac won't turn on... Help?

Just recently (this night,) whenever I would unplug my main USB hub, my iMac (Late 2006) would turn off (that is, instantly shut down as if the power had been disconnected). I don't know why this happened, but it turned on immediately afterward so I shrugged it off. The last time this happened, (the 4th time,) the iMac wouldn't turn back on at all.
It responds to power button presses, and you can hear the harddrive spinning up and the CD drive whirring and fans spinning. The sleep light in front stays on, but the display stays black, and it doesn't make the characteristic chime when it "turns on". In addition, it doesn't seem to be delivering power to USB devices, so there's no way that I can boot up from a startup disc or anything to see what's going on.
What do you guys think could be wrong with my computer? I doubt my non-existant applecare would cover anything of this sort, and I'm pretty sure that i'm SOL for hopes of a computer that just works. In addition, one other question. I was working on a VERY important school assignment at the time, (cliche, I know,) so is there any way I can connect another computer to my iMac so I can get my school assignment off of it?
Thanks, Marcus

monkeyhihi1 wrote:
G5 Intel iMac (Late 2006) Mac OS X (10.6.4)
No such animal... it is either a G5 or an Intel. If it's running 10.6.4 it must be Intel.
Just recently (this night,) whenever I would unplug my main USB hub, my iMac (Late 2006) would turn off ... The last time this happened, (the 4th time,) the iMac wouldn't turn back on at all.
Hard shutdowns can damage both hardware and software.
I was working on a VERY important school assignment at the time, (cliche, I know,) so is there any way I can connect another computer to my iMac so I can get my school assignment off of it?
Only if it will boot intoFirewire target disk mode.Have you tried booting from your 10.6 Install Disk, holding the "c" key?
Have you tried starting in single user mode. If that works, at the prompt type *fsck -fy* remember to leave a blank space before the "-fy".
This will run a file system check, like Repair Disk and repair any problems if it can. If you run into errors run fsck multiple times until it reports OK. Then, type reboot to restart to OS X.
-mj

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