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Model A1311 / Mid 2010 / 3.06 & 3.2 GHz Core i3 or 3.6 GHz Core i5 Processor

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Blank Boot Screen but the Mac still login successfully.

I replaced the GPU (many thanks to the well done ifixit.com tutorials) and the Logic Board Battery after a very long inactivity period.

I made a a clean OS X installation (El Capitan) and now both my iMac and the new GPU work well after the user login, anyway I cannot see any video signal before the user login screen.

All the 4 diagnostic LED are working I checked, but I can’t get the HD selection (option command) at the machine startup - or maybe I can but I cannot see it.

I'm baffled, what is that strange behavior due to?

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This is the expected behavior when using a non-Apple GPU board. The board does not have the custom Apple firmware.

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Hello Dan, let me first thank you for you prompt answer.

To be honest I realized this could be one of the possible causes, fortunately I got an identical iMac and I extracted the M96.rom firmware with the ATIFlash software. If you confirm this is my problem I will insist more firmly for my new GPU flash. Unfortunately I had a lot of problems during my attempts of Windows installation (ATI Flash is not available in mac version).

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