I'm working with an older G4. When I try to start it up, the Mac beeps 3 times at me, and doesn't go farther.

I've read the Mac documents about the beeps, and how it is associated with the RAM. I have reseated all the RAM, and installed known good RAM, without change.

I don't know if I can startup the machine without the RAM (or if I can startup from disc) - I haven't been able to so far.

Any thoughts on how I might be able to move forward.