Re-install it on that machine, (the serial number mismatch is usually fixed that way). Uninstall it while connected to the Internet (this is if you are using 3.21 or 4.0?) then install it on the new computer. If you are using an older version then you may have to submit a Support Email to have MTU reset your registration before yuo can move it to the new computer.
The reason you got the mismatch could well be caused by your hard drive problem. The registration information may have been corrupted by the failing drive.
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Dale Douglass 2nd Generation Karaoke I am not a member of the MTU Staff.
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