My iMac G5 will not run Hardware Test. Please help!!

I need to run a hardware test for two reason:
1. ethernet stopped working [airport does work]
2. if the computer falls asleep it won't wake up
So, I want to find out if it's a hardware or software issue. Problem is, when i try to boot up the Hardware Test nothing happens. The computer starts up normally as if I didn't have the disk in at all.
I am following the instructions in the Hardware test "Read Me" file...put the OS X install disk in & restart holding down the "D" button. The startup screen flashes 2 different colors of grey and then just boots up normally. If I try holding "option" when I restart I get to a screen with the hard drive & the disk as choices to boot, but if I choose the disk I get a really weird screen of text talking about kernel panic & a bunch of stuff I don't know about on top of the grey crash screen telling me to restart.
So after this long-winded question does anyone have any idea what I should do? THANKS!!

Try using 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.

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