Eray,

Your R12-22 is equipped with LEDs both on the Rx itself, and on the on/off switching board. Do these come on at all?

In normal circumstances, you switch it on by removing the jumper (Red "remove before flight" switch pin). On powering up the Rx does a battery check and then the LEDs light up depending on the status of the Rx. The green LEDs should light up in some fashion, depending on status and Rx type.

I suggest you check your batteries are charged to 8.4 volts, check they are plugged in correctly, and check the jumper is removed from the switching board.

If no LEDS come on, then I suspect it will be fried.

Hope this helps..