APM 2.7 will not arm.

This APM has been flying great for many flights. Now it won't arm. I sure need some help.Good GPS and no Prearm messages. It will arm and run fine with USB plugged in but quits when USB is pulled. Won't arm with only battery. I show 4.95 volts on all three rails. I've got the JP1 pulled and am powering the Input rail with one of my ESC BEC. Please help.

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