Alpine mrx-v70 no sound

The amplifier was installed perfectly in the back seat passenger of my SUV,
i used
4 gauge wire for power and ground, 16 gauge wire for four JBL GTO638 6-1/2 (60 Watts) speakers (2 ohm each one),
12 gauge wire for one Rockford Fosgate R1L-2X12 (12" 300 Watt 2 ohm).

I followed all the configuration steps as mandated by the Alpine manual.

The problem is that the amplifier sounded perfect the first day, but the second day on my way to the office it stop sending signals to the speakers, the blue light of the amp still ON and everything is ok, the voltage, the signal output of the Head Unit, all cables and connections, everything is fine but no sound.

My head Unit is a Kenwood KDC-152 it only have 4 channels speakers outputs + 1 RCA Rear/Subwoofer, so I connected all 4 channels to the amp's high inputs and the HU's RCA to the RCA input for subwoofer on the amp.

Can you guys help me to determine what is happening please?

i had a clarion dd hu do this minutes after installing,and i ended up hitting a reset button for the hu,some are found just behind the face/cd flip down ect..you may have also accidently hit a mute setting..a friend did that once,and he had no tunes for 3 days till he figured it out..lol..couple things to check out

Thanks for the comment but that's not the problem,
I checked the HU'outputs and it produce sound
the problem is with the amp
maybe the amp'speaker outputs burnet out
if it is the case is a shame, I only have it for a week
the question is Why happened that ?

If you just bought it take it back and have it replaced. Alpine has a 1 year warranty. I have had this happen to me a couple months ago. I had this happen to me with a MRX-V60 also. Alpine has made great stuff in the past when they were manufacturing out of Japan. Now it's coming from China.