After Hard System Freeze, Login Screen is Pinstriped and Unresponsive

I had a hard freeze on Sunday on my G5/2x2 PowerMac running 10.5.6. I could move the mouse, but nothing else on the system responded. The dock wouldn't even unhide. I couldn't force quit anything. So, I shut down the system using the button on the Mac. When I tried to start the Mac, I got to the login screen, but it had a pinstripe and then froze on the screen with the Apple, but no login screen. I tried booting with the shift key. Same. Then, I tried booting from the internal back-up drive and a got a pinstriped screen with a question marked folder, then the same freeze. The same happened when I attached a firewire boot drive and tried to boot holding cmd-opt-shift-del. Same result. Any ideas? Thanks.

In my original post I said that, after the hard freeze, I restarted my Mac and got to the login screen. I did NOT get to the login. I meant to say that I got to the grey screen with the Apple logo. I don't know if that makes any difference in diagnosing the problem. Thanks in advance for any suggestions.
EDIT: Also, when I tried to zap the PRAM, the system never chimed. As I said, the screen stayed black the whole time and I held the keys for more than two minutes, which is way longer than it should take based on my experience from back in the 1990's. I don't remember having to do it since I switched to Mac o/s X.
Message was edited by: Neil2

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After Hard System Freeze, Login Screen is Pinstriped and Unresponsive

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