The black screen could also be due to the driver autodetecting your monitor's optimal settings improperly. The cleanest solution would be to use the older driver and force Windows to never update them. dll files have the same names and go into the same Windows folders so invariably one of those cards won't work).
The problem is your HD7540D IGP is a Legacy device that needs the older drivers, while your discrete HD7770 card can use the newer ones which are incompatible (a LOT of the. So for your 64-bit Windows 8.1 you normally should be running one of these Crimson drivers Unfortunately if you manually install Catalyst on the still supported HD7770, WindowsUpdate will "helpfully" upgrade just your drivers to the latest Crimson versions-which will of course BSOD with the old Catalyst Control Center. 15.7.1 is a great choice for Legacy products like HD7600 and lower, because it's the last Catalyst ever so you don't need to ever worry about some update borking things later, plus the only Crimson driver released for these was a terrible beta.
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