Before labelling the burner toast, stick it in another machine and see if that rectifies the problem.
IMO it's likely your power use. I've seen this happen a lot if you have fast revving HDDs and a high power eating burner, and a power supply inadequate to the task (and no, just because the sticker says 500W doesn't mean it's up to the task). You can get various power use tools around the 'net, tho most frequently your motherboard manufacturer will provide something that will allow you to monitor your "PC Health" (or something along those lines) -- these tools are designed for checking thermals, but frequently show you power consumption as well.