sketchy CD-ROM

my friend has a HP omnibook with a sketchy CD-ROM drive that reads CD-Rs or RWs about 25 bercent of the time and some manufactured cds wont even work. I have tweaked the POT it worked once and then it got worse. is there something in the BIOS or windows i may have to change. BTW the cdrom drive is a TORiSAN(now sanyo...i think) CDR240U.Thanx for the help.
 
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