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manuelhi-99

macrumors newbie
Original poster
Sep 6, 2020
2
0
Hi guys,
i bought a Dell GTX770M, modified the cooler and flashed it with the bios of Nick (I thought so). The problem is, if i insert the graphics card, theres a blank screen but i can hear the chime. The motherboard status leds 1 and 2 are on, 3 and 4 are off. That means that the graphics card is not detected properly. I flashed with a CH341A. But I cant find the right chip there and it says chip main memory with the contents are in disagreement. I have a PM25LD020 (CE1320, =669XG) thats whats written on the bios chip, but in the programmer software I can't find a chip with PM25LD020. Can you help me fixing this? Thanks and with best regards. Its a Mid2011 27inch Imac with I7 2600 and 16GB RAM. The bios i tried to flash is attached.
Manuel
 

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