GSM module Sim900

Hello everyone,
I have a problem with my phone,
I can not light it,
yet I have already feed it with 12v, 2A adapter
the power indicator is on ,
when I press the power button the status light comes on and when I release the button, it goes off, saying that the netlight light does not come on,
could someone please help me

The PWRKEY pin is only pressed for 1 sec to GND and released to turn the module ON.
Are you talking about the PWRKEY or the Power line connection button?

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How many voltage suppler for module?
I user sim800L, it working fine. please see

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thanks for reply , but , i buy a new module sim900 ,and iā€™d like to know how much voltage do i need ?