Burner opens/closes repeatedly

As soon as I power up my system my Philips burner begins opening and closing repeatedly – maybe 15 minutes later it stops. I’ve read of a trojan called CDTRAY, but my system’s virus scan runs clean and there are no registry entries suggesting a virus. Anyone ever seen this? When it’s doing the open/close thing, the system is only intermittently useable. After it stops, all is normal even the burner works fine. I’m stumped.

Test the drive in another computer to be sure it’s not the hardware…