Both green and red ligt or on my jensen ka3

Generally, the power light is green and the protect light is red. If the protect light is on there could be a short in the wiring or there could be an internal fault in the amp.

Disconnect all speaker wires from the speaker terminals of the amp and disconnect signal cables from the amp. If it powers up, the wiring needs to be checked. If it still shuts down (goes into protection), the amp likely has blown output transistors.