Odd that both would go bad at the same time. When you hear the drive mech is that from the kb?

If you hold/tape the doors down will the tray open?

Boot from the Recovery partition if on one of the Lions, or from an install DVD if lower, have a disc in the other tray. Launch Disk Utility from the Installer screen and see if the disc ejects okay from there, to eliminate software. I don't know if the kb would work then but you can try that too.