Tomb Raider Chronicles, Tetris, and Dave Mirra

[DocShriek]

Hi folks. Got a weird problem. People in DirectConnect couldnt really answer this one, so Im trying here.

Here is the story. I burned Dave Mirra, Tetris 4D, and Tomb Raider Chronicles. Dave Mirra works fine, EXCEPT, no music. Tetris and TRC dont load at all.
Now I figured they were bad burns..BUT...the exact same discs WORK PERFECTLY on two other Dreamcasts. now, what is up with this? My DC was made in May 1999, before the release of the system. I got it on Ebay, so I dont know what version it is, or specs..At least 25 other burned games work perfectly, except these three. Can anyone explain? I would greatly appreciate ANY advice or help.