Beagle board Fail booting

I've a BeagleBoard xM rev C, i'm using an 5V-2A power adaptor.

Everytime i try to boot the beagle with two usb plugged it restarts
itself, if i just plug one it boots correctly, i was using a 1A power
adaptor, but someone told me it was to low in A, so i change it but
the problem is there anyway, if i use 2 usb ports it fails booting
after loading the kernel, any help is appreciated.

What do you have plugged into the two USB ports?

Gerald.

Hi,

  Please use 5V 3A power adapter.

Regards
vinayak