Boot freezes on Apple logo no matter what I try

The problem began when I was playing a podcast. Things started locking up on the screen, and I was getting fragments windows while trying to back out and force quit. I was able to start up once more after that incident, but things froze again while playing music on iTunes. The music continued to play, but the screen and keyboard were locked up. Since then, I have not been able to boot past the white screen with the Apple logo. What I've tried:
1) Booting from OS cd (with original HDD, new HDD, and even no HDD). Still freezes.
2) Replacing upgraded RAM with the original RAM.
3) Reseting PRAM (commandoption+pr) Heard second chime, but problem persists.
4) Started while holding option (I get the choice of startup drive, and mouse works, but still freezes on logo)
5) Boot to a drive that has Windows installed (dual boot system). Get black screen.
6) Held power button for 5 seconds with cord unplugged
7) Unplugged all periphials.
8) Tried different monitor and keyboard
9) I can startup in verbose mode (command+V) and see info, but still freezes at logo

I just got exactly the same problem with my MacPro (2009) last night, exactly the same errors Rich666 have. The oddest thing is that I can access trough my local network within a Mac G5 and see the entire hard drives with all its documents??!! this means, the computer is working, but the screen shows only the gray screen with the logo, but frozen.
I've tried reseting the P-Ram, The Apple Hardware test, Boot with shift pressed to make the system load in limited version and I can't boot from the dvd, nothing works, always the same, the grey screen with the logo.
Last night I ran the Apple Hardware Test and after finishes didn't show any error, I decided to do "hakuna matata" turn the computer off, and try again the next day, this morning, it worked!... for just a few minutes, I saw the finder, and when try to open a finder window, again the odd windows frozen, the screen turned like it was 16bits and crashed again, and right now is like last night, frozen screen, tried the same over and over, I still can see the damaged computer hard disks through the network, the computer sounds like the regular working sound, but the only I can see on its monitor is the gray logo frozen. Frustrating

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