SIM900 wont respond

Hey,

My SIM900 module that was working till yesterday stopped communicating via my arduino uno board from today. The same setup, wiring etc were used. This is truly a bit mind boggling. I was infact able to connect it using the M2M Module tester yesterday and today it says that "invalid or no response".

I rechecked my wiring and sketch and all seems to be good. I am also able to call the SIM900 and it beebs showing that the call gets connected.

Its like i have been locked out of the SIM900 module. I am also unable to set the baud rate of the SIM900 module because I am unable to connect to it.

Any help is much appreciated as I am behind this for the last two days!..