Steve,

I'm not sure that they require a working PRAM battery, when I had my 6320 the battery never worked, But bad powersupply's in those computers are very common, in fact, when I recieved my 6320 the power supply was bad in it. and my grandparents recently bought a 6300 from a garage sale, it also had a bad powersupply.

I say that you should scrap it, They aren't fun computers to work with, and they are painfully slow.

Good Luck.

Blake.