I have been doing some work on the car for a while and had the battery disconnected for a few weeks. When I re-connected it, the alarm (Viper) started going off. I got that to stop and was able to start the car, but now the radio won't work. I know about entering the code, but my display is completely blank - I can tell the backlight is illuminating, but there is nothing on the screen. When I turn the car off, the 'anti-theft' light just stays on glowing a solid red.

Anyone ever encountered this? I'd put in the code, but it's not even asking for it!

Thanks!