94 940 cd player alarm?

[94_3.4]

hey all, i just bought an alpine stereo for my 1994 940 station wagon. i unplugged the negative battery terminal, and removed the stereo, and installed the new one, but when i reconnected the negative terminal, the alarm started going off and the ignition wont work. went back and put the old stereo back in and the alarm still goes off. now i cant drive anywhere, and there is a very annoying alarm every time i connect the battery. i dont have the owners manual and i have no information on how to turn the alarm off. help?