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Sounds like something is shorting out and it is in protection mode. Check that the wiring is correct and there are no bad spots on the power wires. Unhook the power before starting your evaluation and leave disconnected until you think you've found the problem then rehook the power source. This will give the system time to reset if it needs to.
sounds like maybe a speaker short, try unhooking your speakers and then powering up your amp, if it then powers up with the speakers unhooked try hooking up each speaker one by one untill the amp goes back into protection and then you have your bad speaker.
I'll assume that you've checked the amplifier's on-board fuses.
With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.