IMac G5 (no iSight) TV-OUT stuck, even after unplugging the mini DVI adapto

Hello.
I have an iMac G5 (2.0Ghz, no iSight) for some time now and everything has worked great. I also have the mini DVI adaptor, which connects the iMac to an analog TV. This connection has also worked fine over the course of about a year now. Last night, after watching a movie on the TV through the iMac, I unplugged the adaptor, expecting the iMac to detect the unplugging, and revert to the original resolution, however that has no worked. After selecting "Detect Displays" from the menu, nothing happened. Restarting also hasn't worked. When I tried to plug in the adaptor back, the output to the TV also worked great, but unplugging changed nothing.
I tried to fix permissions on the drive, and though there had been permissions to be fixed, after doing so, nothing changed.
I tried booting from the installation CD, that also didn't work.
I tried booting from my iPod, on which another operating system is installed, that also didn't work.
I also read on the internet, here:
http://www.macworld.com/forums/ubbthreads/showflat.php?Cat=&Board=UBB3&Number=35 9860&page=0&view=collapsed&sb=5&o=&fpart=1
About a person with the same problem who also tried to zap his PRAM, but to no avail.
Is there anything else I can try?
iMac G5 17" with no iSight   Mac OS X (10.4.8)  

Hi jhanan-
Greetings and welcome to the Apple Discussion boards
It has been my experience that when all else fails it is the power supply.
Luck-
-DaddyPaycheck

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