apm 2.8 wont arm 4 beeps

dji450 blew an esc so replaced and didnt calibrate. drone would take off but started to have a little spin so brought it down. not hard. it fell over and that was about it. since then it will not arm.i have sonce recalibrated the esc's and motors seem to respond normally to throttle after that process. turn off and plug the battery back in and get 4 beeps, doe ray la tee. the blue is solid with red flashing. missionnplannner says gps is cool and everything else looks good i guess. flyght mode is stable . you can see all switches and controlsnare working in mission planner. any ideas?

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