Installed Safari 3.1, reboot, computer won't boot fans go into overdrive

Okay, I installed the Safari 3.1 update and restarted my computer. However it won't boot now. The displays stay black and after about 30 seconds the fans in the G5 kick on full blast.
I've tried shutting it manually and unplugging the power cord from the back. I also tried zapping the PRAM.
Help? I would appreciate it.

My computer is also now not restarting. First Safari 3.1 had other apps stop working and now the computer won't restart. I tried Safe Boot and zapping the PRAM but it just cycles through two different blue screens.

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