AVR GSM stat led not blinking

I bought a avr-gsm dev.board from Olimex by coolcomponents.co.uk.

I have rev. B

12 volt is connected, green led is on (power).

Usb is working as comport.

But the Gsm module is not working.

I have put in a sim from Simyo without pincode (disabled by gsm phone).

Any advise in how to proceed with error checking?

Solution: throw away the inferior jumper for the battery_enable.

Put in a good one. And it is flying.

Thanks Olimex for another great product.