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car running or not? if it works with the car off then I would check the alternator, your car will require more power from your already low battery causing your radio to not play. If it won't start either way check all of the wiring going to it including your speakers. Could be loose or shorted wires. Could also be the switch on the unit. only way to know is to take it apart and test the switch. If all else fails then have it looked at.
This could be the reason. If you look at the specs for this amp you will see that the continuous power out is rated for 380W bridged. The speakers rated at 450W should be able to handle close to 315W continuous. Now if you split these numbers being you have bridged these speakers, you drive each one up to about 190W continuous. The speakers are being driven approximately by 60% of the rated capability. I personally like to keep it right where you got it, not exceeding 80% of the speakers rated capacity.