Did you replace it with a new or used DSP amp? If you installed a used DSP amp, it probably just needs to be coded by a dealer to make things right. (A new amp definitely needs coding to work properly.)

__________________
SOLD
2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input