Power Mac - PowerMac G4 switching off all the time

Hiya all,

I recently bought a PowerMac MDD on ebay. Everything seemed fine but suddenly I started getting a message saying 'Please restart your computer' randomly, when I start the computer, or when I do pretty much anything. The applications often crash, which was never the case with the IMac I also own, and lately a weird report starts appearing on my screen saying something about kernel, and cpu1 problems. Just some status report going from top to bottom finishing with a line 'Waiting for remote debugger connection'. Does anything ring a bell? Is it just bad RAM, as I gathered from reading google findings, or something really bad.

Stan