Hi Nic,
Last tests...
-Update bios for Hp Probook 4540s
-Update drivers for Amd Radeon 7650M (amd radeon hd 7500M/7600M series)
version 13.11 9.5 beta(3/12/13). No errors during installation and appears installed correctly.
Catalyst control center don't run but a new amd software (amd gaming evolved) run correctly.
After reboot black screen, and intel hd graphics 4000 error code 43. Only one error... There aren't drivers or
drivers are wrong... But on display adapters amd radeon work correctly.
-Uninstall intel graphic card drivers and make Manual driver Installation method
Black screen during installation.. wait a few minutes and push power button to reboot...
After reboot... screen ho says more or less "New graphic drivers installed correctly" and push Finish button.
So... always black screen when system enable intel hd 4000.
This is my dxdiag after these tests.