Problems with SIM900 DB no resp

i’m using arduino uno + sim900 icomsat v1.1

i want to test my gsm module with my library but i have problem.

when i test with GSM library

GSM Shield testing.
DB:NO RESP
DB:NO RESP
DB:NO RESP
Trying to force the baud-rate to 9600

1200
2400
4800
9600
19200
38400
57600
115200
ERROR: SIM900 doesn’t answer. Check power and serial pins in GSM.cpp

status=IDLE

and in my picture sim 900 error.jpg always ATT : OK | RIC : | ERROR

please help me :"(

i want to test my gsm module with my library

Which library would that be? What code are you running?

The code tells you "Check power and serial pins in GSM.cpp" have you done so?

Find another library and test it with your SIM900, it might work.