Check both the internal fuses on the amp and the in-line fuse on the power cable. If possible check them with a meter, not just by eye, because I've had fuses before that have blown but they looked fine visibly. I tested them with a meter and no current was actually passing through them. If that isn't the problem it is very likely that either the ground is not proper or the remote turn on wire (the one that connects to the system remote lead on the back of your CD player) is not connected properly.