Cannot open CD or DVD drive: F12 and Option+F12 do not work anymore

Hello everyone! I hope there is an easy answer to this.

I have a G4 MDD 2003 with a combo drive and a "superdrive" that I added myself. Everything works. But recently, the keyboard commands that used to open these drives do not work anymore. I am using Tiger.

Note again that both drives are working. I know because I can open the doors manually and hit the button on the front of each drive with my finger. They open, I can mount discs, and I can burn discs.

When I try to use the keyboard commands, nothing happens and I don't even see the transparent Eject symbol on the screen.

Here's the hardware, shown in the System Profiler:

PIONEER DVD-RW DVR-110D:

Firmware Revision: 1.11
Interconnect: ATAPI
Burn Support: Yes (Apple Shipped/Supported)
Cache: 2000 KB
Reads DVD: Yes
CD-Write: -R, -RW
DVD-Write: -R, -RW, +R, +RW, +R DL
Burn Underrun Protection CD: Yes
Burn Underrun Protection DVD: Yes
Write Strategies: CD-TAO, CD-SAO, CD-Raw, DVD-DAO
Media: No

TOSHIBA DVD-ROM SD-R1312:

Firmware Revision: 1A06
Interconnect: ATAPI
Burn Support: Yes (Apple Shipped/Supported)
Cache: 2048 KB
Reads DVD: Yes
CD-Write: -R, -RW
Burn Underrun Protection CD: Yes
Write Strategies: CD-TAO, CD-SAO, CD-Raw
Media: No