USB Hub not detected

Hi,

I am new to Beagle board. I am using ver B7 and uImage 2.6.28. My
beagle board is not able to detect my USB hub and the mouse connected
to it. I followed the instructions to short pin 4 and 5 of OTG USB.
The USB hub is self-powered by an external 5V adapter. Anyone can
help?

Regards,
Xie