Is my powerbook dead?

My tibook has been having kernel panics (Both with the polite message telling you to shut down your screen, and the one where a bunch of code rolls down the screen and it freezes). Also the computer sometimes just plain freezes sometimes and it also just shutsdown randomly. What could be the problem? I don't think its the ram, i tried both sticks independently and it still happens, unless both the ram sticks are bad.

Update: After resetting the pram, the computer now just hangs at the apple logo startup screen with no spinning thing underneath it, just the logo.

Here is the kernel panic logs, it says 1976 because my pmu battery is dead.

After my iBook G4 did a few kernal panics and a reset, I got the same thing..gray screen, Apple but no gray wheel..and it was my processor dying..this happened twice to me! Has your PB been extremely hot the past few weeks?