I installed an internal ND2500A about six months ago, and it's been great at everything. Then suddenly a few days ago, while trying to burn an audio CD in MMJukebox, I got an 'unable to burn due to unknown error' message. I attempted to burn an audio CD with another program, and then got the same message. While it will burn a data CDR, it won't burn a data DVD (those are the only tests I've done so far), because it gives me a time out error. I recently had installed ITunes as well, and I thought maybe too much software was causing the problem, so I uninstalled that, and then did a system restore, but I'm still getting all the same problems. Any advice on how to figure out what's wrong and how to correct it would be greatly appreciated. Thanks.