No power lite on my Pioneer amp

[srburton]

I just got this car and the amp sets under the driver seat so it is difficult to get to but i wonder if it is as simple as a fuse.
The power lite is usually on with the key,i just noticed the lite is out.
I have 12 vdc coming in to the unit.
It is a pioneer gm-4000 amp.
There must be an internal fuse,anyone know?
I will probably take the unit out but i was just trying to save doing that.

[Frank]

You have to open the amp and firt thing to do is to check the main fuse and if that is good you have to check other fuses along the circuit.