Problems on 2 Ardupilot Mega board

Hello!

I don't understand. I have 2 Ardupilot Mega (V1.4 and old version) with a strange problem.

The V1.4 doesn't have any reaction (blue led off) when I power up the board plugged on my receiver, however the receiver get power from the board....

The old version has the blue led alternatively blinking but I don't have reaction on my mission planner. I tried to connect two receivers on it but nothing happens.

I tried to flash the encoders with my AVR programmer and with the V1.4, the flashing process worked but with the old one it is impossible to make it .... and the two problems remain ...

Do you have some ideas?

Thanks

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