Beagleboard-XM overvoltage problem


I've some issue with Beagleboard-XM Rev-B. When I power up with USB-
OTG booting works fine, but just after decompressing linux kernel
overvoltage LED glows.
When I tried connecting DC supply of 5V-2A and 5V-2.5A, board always
show overvoltage indecator.

Does anyone faced same issue? Any solutions?

Thank you,