Uno and GSM shield SIM900

Hi,

i just bought a two Uno shields and two GSM shields.

No i have follow problems:

SIM900 modul and component U1: LM317 getting very hot.

I can upload codes to Uno and code running but GSM_GPRSLibrary_AT examble says in serial monitor ->

GSM Shield testing.
DB:NO RESP
DB:NO RESP
DB:NO RESP
ERROR: SIM900 doesn't answer. Check power and serial pins in GSM.cpp
status=IDLE

I was uncomment pins to GSM.cpp

Please tell what i do wrong.

Thanks any help

hi ya can u tell me what program u are using

I have the same problem
I am using Uno r3 and GSM shield from open-electronics (http://www.open-electronics.org/arduino-gsm-shield/)
I did un comment #define GSM_TXPIN 5 and #define GSM_RXPIN 4 in GMS.cpp.
Trying to run "GSM_GPRSLibrary_Client.ino" from SIM900IDE100