Won't boot and fans go mental

since updating to 10.5.5 my 17" iMac has began to fail. not sure if this is a coincidence or something to do with the recent updates.
after about 10mins it started to freeze up with the spinning beach ball of death
then it would freeze after 2mins
now it won't boot and the fans go mental and it shuts itself off.
i held down some keys to get the text up of the booting process and first it went on about "intelPSU missing" or something and finally would say "I/O error" "14 majors" and stuff
could it be the hard drive?
could it be the ram?
could it be the power supply?
stupid mac
i can get it into target disc mode but my macbook pro doesn't see it.

It's probably a combination of a failing power supply unit and logic board. I suggest you take it in to be looked at.
Try booting from your install disc and running Disk Utility to check things out.
1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume.
6. Click Repair. Disk Utility checks and repairs the disk.
Reboot from your hard drive and repair permissions.

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