I had a similar problem with a Lite-On iHAP422 burner. The difference is my problem was all it wanted to do was make coasters. The solution was to swap the iHAP422 to the end of the ide cable and set its’ jumper to be the master drive. Then, I put the dvd-rom in the middle and set its’ jumper to be the slave. I haven’t had a problem since. It turns out the iHAP prefered to be the master. Now, this is only hear-say, but, I have heard that most burner drives,reguardless of manufactorer, function better as the master…which is why I tried switching them around. In my case, it did.