SCCM2012 Agent services stopped/ failed to start successfully

Hi there,

We are in the middle of SCCM2012 deployment and Windows 7 implementation.

In our Windows 7 Gold Image we do include SCCM agent with autodetect parameter.

We have already deployed about 500 windows 7 machine prior of SCCM2012 infrastructure setup as PC deployment is urgent for few site for new employee intake.

Problem that we facing now is those 500 machine that deployed earlier only 150 reported back to SCCM and the rest is missing from SCCM database.

for new machine with same image do manage to report back to SCCM environment.

I am wondering is there any possible chance or setting in SCCM agent that say after 1-2 month attempt to FIND SCCM Site and it keep failed and will make the service stopped permanently ?

How can we tackle situation like this to find back the 350 machines?

Ong