Ricoh won't burn now

All of suddent my Ricoh 7060A won’t burn a CD-R. It does CD-RW writes/rewrites/reads no problem, but everytime I try to do on the fly (I know, bad idea)which used to work, or even burning an image, the simulation in WinONCD goes fine, and then the actual burn starts and it all just freezes. This drive has worked fine in all ways til now, so I’m wondering if this is mechanical or what. I just reformatted drive C: and reinstalled Win98 and a couple of burning programs (WinONCD and Nero) but neither will burn a 74min or 80 min CD-R. I’m stumped!