MBP audio no longer plays from my speakers...Optical light stays on

Ok, so the other day, I'm using my MBP in the studio, and patch a cord out of the line out jack to listen through the monitors. Ever since then, I no longer have audio through my internal speakers, and the optical light is on all the time. No volume control, and the audio page in sound prefs only shows the digital option. Not something I'm going to just deal with. They WILL make this good. BTW, this is my first post, but I've been reading nightmare stories from all of you out there, and someone at Apple needs to step up to the plate and get these issues resolved. These units are too expensive for us to have to put up with this shoddy example of workmanship. If these were cars, they would have been recalled. Are they not making enough money on the Ipod stuff?

APPLE, IF YOU'RE READING THIS, GET OFF YOUR @!#$@$ AND DO SOMETHING!

MBP Mac OS X (10.4.7) 2.16 gig 15" 100 gig HD 2 gig ram