This is a problem as old as the trade with both windows mac. Hardware EDID emulators has always been the solution and I personally will never do an installation without them.
Fubbi
@dillthekraut said:
Then there are hardware EDID emulators which do the same Job, if there is no software solution. As they are connected straight to the Computer, they might be more reliable in the long run, than the power up procedure, told above.