Gfx card 2011 to 2010 black screen 30 seconds

[Yordanov]

I took a broken card from 2011. I replaced the GPU and want to test. Don't have Imac 2011 27 and I tested to 2010 27 but it takes 30 seconds
​​​​​. First black screen and then after 30 seg it appear the desktop. Later work ok. Is that normal?

 

[dukefawks]

No, what GPU did you replace?

 

[Yordanov]

Was 1000, I put 8006 and flashed bios.

 

[dukefawks]

EFI part of that BIOS is not working and it will only work once OSX is booted and is using the PC part of the VBIOS. I made that 8006 bios and it should work if you got a real chip. Very possible you got a fake remarked chip.

 

[Yordanov]

Thats possible, as 3 weeks ago I replaced same chip from 1000 to 8006 and works ok. So you mena this is another chip, right?

 

[dukefawks]

I have no idea, you bought these chips. If they are not the 1649 date code ones then it is possibly just Chinese reballed garbage as usual.