Can't Zap the P-RAM , Can't start from an installer disk with the C-Key...

Can't Zap the P-RAM , Can't start from an installer disk with the C-Key... or The D-Key for Apple Hardware test or run with the shift Key in Safe Mode!!!
About a week ago I started to have problems with the Mac after 10.5.6! First the Mac after shut down would restart on its own in 10 to 15 minutes. I read in various forums about some of the 10.5.6 problems. I did a clean reinstall where the Mac created a previous system folder. After this suddenly mail, I-Chat as well as some other programs would open, then close immediately! Since I did not have things backed up because I didn't have a large drive, I dragged my files and apps to another drive and reformatted the drive zeroing out all data and did a fresh new install then brought in the combo 10.5.6 update.The Mac is running correctly but I can't Zap the P-Ram, startup from the Mac OS X installer Dvd with the C key or run Apple Hardware Test with the D key or boot in safe mode with the shift key. I can boot any of the Bootable disks from the start-up Disk in Preferences.
I went over this with Apple and they suggested I run the Apple Hardware test. It won't run on this machine because I can't boot it with the D- Key. I ran tech Tools and every single thing checks out OK! This Mac has worked great since I got it in I believe Feb or March of 2007.

Make sure that you don't have firmware password protection enabled. It will prevent some boot key shortcuts from working, like clearing NVRAM, etc. You can disable firmware password protection by booting off the OSX DVD and loading the utility.

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