Imac g5 wont power on?

i have an iMac G5 that i recently bought from one of my dads friends who had never really used it. (he had also bought it used)
my problem:
when i push the power button the fan turns on very quietly and softly. and after a bit it starts to work really hard, no start up sound is heard and the screen doesnt turn on.
I have reset the PRAM and the SMU and both methods only worked once in a while.
and when it did turn on it would freeze (sometimes after a while and sometimes right off the bat) and id have to shut it down,
I have checked the diagnostic LEDs and the power supply is running as it should.
only things that are noticable with this computer when i opened it up was that
-there was no fan cover
-the middle screw was stripped
-the power cord isnt an authentic iMac power cord, it looks to be one from an old windows computer or something of that sort.
i am also not using an apple mouse or keyboard

If you have the original install disc, boot from it and run
Disk Utility
   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.
   7. Reboot from internal drive
Let us know what you find out, please.

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