Alpine amp power but no sound!
 

So I have a 3 day old alpine m500 with a 12" type r sub in my bmw, it was working perfectly for a few days and then all of a sudden it stopped working. The amp is getting power but producing no sound, Tested the sub it self works fine. Threw in a different sub still no sound... Then tried out 3 different alpine m500 amps still no sound, I've checked all the fuses all okay.
However my amp does slightly blink blue instead of a solid blue.
What could be wrong? It was working just fine.

whats the impedence of the sub? if its below 2 ohms then the amp will go into protect and not work.

Get a volt meter and check the voltage of your power, ground, etc.
I'd suggest visiting one of our sponsors to get a proper diagnostic.

Who did the install? Check all the power and ground leads.
The blinking blue light should mean you are not getting constant power.

The amp should light up red if it goes into protection mode IIRC.

If you shorted out the RCA's accidentally you might've fried the RCA output section on the deck. Slimmer chance, but it does happen. Pull out the deck and plug it into a different RCA output.

In one rare case I saw someone fire a screw through their RCA when bolting down a box and that cased the issue.

If you have tried 3 different amps and still no sound.. Its probably either not getting the signal or your main fuse is blown.. as some amp's power light will still lights up from the remote turn-on even with no 12V+ in.