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iMac 27" 2011 Video issues

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Ryanlen2

Member
Hi.
This iMac turns on with no video. After a minute of being on the screen turns white then proceeds to login screen. After I login the screen turns black again. No external video whatsoever. 3 LED's lit on logic board. I also have another 21" that has been here for a while that is doing something pretty similar. Same year. Thanks have a good one.


***Also forgot to mention this has a new logic board installed. Thanks again.
 
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dukefawks

Administrator
The one that only turns on after booting is probably a non original Apple card. A video card without an EFI BIOS will only work once the O/S has booted.
 
R

Ryanlen2

Member
It does do that. It enables when login screen is present. But once I login with password it goes black again and shuts down. Thanks.
 
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