First do a motherboard reset....remove all power from MB and remove battery for 30 seconds....
Try reboot....
Then
Try removing all amd drivers with AMD CLEANUP TOOL
http://support.amd.com/en-us/kb-articles/Pages/AMD-Clean-Uninstall-Utility.aspx
....then start pc with no display drivers......
Check in device manager if you can then see it...
If not continue.....
In device manager also go to view>hidden devices and see if it is in there. If it is, uninstall it..reboot check again.
maty