harley: power calibration errors are caused mostly by poor media. (cheap branded cd's ie. promedia) - try using a different brand (compusa, tdk's, memorex, sony) are the best bet; don't waste your money on cheap disks - youll just waste them. also, keep you cd writer clean by using the cd cleaner kits, a dirty lens will also cause the callibration errors!!

If everything is to no avail, then maybe a firmware upgrade will do the trick. Have a look at http://www.cdfreaks.com/drive/firmware/574