Based on some Googling, I thought my CompUSA-branded DVD-RW was a BenQ 1640, so I flashed it with the GSHB version firmware using BQFlasher (it was originally GCxx - can't remember the last two letters). After a restart, the drive appears totally dead - it's not detected by the BIOS, the LED does not illuminate, and the tray does not open.
Popped it out of the computer and discovered that it's actually a BenQ/Philips DW1650. Oops. Is there any way to resurrect this drive? It's not detected by Windows or the BIOS, so re-flashing does not seem to be an option. Any suggestions?