Parasound A21 help?

I just received a used Parasound A21 amp and I am having a problem. I am not getting sound from the amp. I have gone through a quick check and have determined that the amp is not getting even slightly warm when powered on. I have the switch on the back set for manual turn on and when I turn on (push) the front switch it lights up blue and the parasound light in the top center changes from bright red to dim. The owners manual says the power switch should go red then change to blue when turned on. It doesn't. I have let it sit for about 20 minutes and no warmth. Would the lights come on at all if the fuse on the rear panel was bad? Should the amp get warm without any connection except the power cord? Any ideas?
The "on" button should light up red and then after a few seconds you should hear a click and the power switch will glow blue. Check your speaker hook ups for any shorts or try disconnecting the speaker leads.

If the rear panel fuse is blown you will not get any lights whatsoever.

The amp will get midly warm when turned on (blue light), even warmer when playing music at loud levels.
That is what I thought about the fuse/light situation. Turns out the lights will still come on around the power button and the "P" at the top if the rear panel fuse is blown. The channel lights in the middle will not. Replaced the rear fuse and its good to go. Parasound says the A21 is the only amp that has this situation. Maybe this will help someone else in the future.
Very unusual. thanks for the correction. Glad it was only the fuse.