Ok my problem is that i installed my car stereo about 4months ago and everything worked perfectly and i had no problems with it and the other day i had to take it out and this morning i put it back it but it dosent work the light dosent come on their is no power going to it any suggestions

Double check the feed and inline fuse. Also, make sure the memory wire is hooked up and its fuse is good. If all looks ok, make sure the grounds are good, including the metal frame of the radio.

Steve