I had a server that was erroneously configured for PXE booting (WDS-server was initialized, which pretty much makes PXE booting from SCCM not work).
So the fix is obviously to disable PXE in SCCM; remove and re-add the WDS-role. Pretty straight-forward and very simple in SCCM 2012. Simply go to the distribution point and deselect PXE; and SCCM should handle the rest. Just make sure everything is removed before you re-add it.
That is; remove the REMINST-folder, and the bootfiles-folder under C:\Windows\Temp; and make sure the WDS-role disappears from the Server Manager.
Only it doesn’t work.
If you un-check the PXE-button, the apply-button doesn’t light up. You can click OK, but nothing happens. In essence what we professionals call ‘a bug’.
So instead of banging you head against the wall: go to the ‘general’ tab; and do another minor change; change the expiry on the certificate, for instance. Click apply, and ta-da; the change to the PXE role is also applied.