So last spring I rolled out SCCM 2012 and set up the whole boundary group/discovery thing so that it automatically populated my device and user collections based upon Active Directory. All of my computers (app. 750) have been available in SCCM for a year now. All was good - I was interacting with my comptuers and deploying software through SCCM with no issues. Now I'm doing OS re-installs (the OS image does not have the SCCM client pre-installed) on computers. These are computers that were previously known to SCCM, but after restarting them with a fresh version of Windows, the SCCM client software does not get re-deployed to them. I've let them sit for hours, days, even a week. I have Client Push Installation configured for the site with an account that has both rights to the SCCM server as well as local admin rights on each machine. If I browse to that machine in its device collection (where it remains listed), I can right-click it and manually install the client. That works just fine. But I don't want to do that for 750 machines. Can someone please tell me what I'm missing? Thanks!