my burn drive is a tdk velo 48x unit, using nero 5.5. xpress. i'm unable to burn any audio cd. burn stall and locksup. have tried varied remedies from software to bios upgrade to firewall disabling but problem persists. the unit is past the warranty period. question: should i invest in a new drive or do you suppose the problem lurks somewhere internally and is there something i may have missed? please advise .