Post originale di: Chris Yates ,
'''UPDATE - 11/10/20''' I was able to locate a replacement main logic board for the 2546 iMac 27. Albeit, it was a downgrade on video memory from 2GB to 512mb. Again, iFixit’s guide for logic board removal was perfect: [guide|15777] I carefully disassembled the legacy logic board and swapped over the: proc, ram, sdram card, and wireless card. '''New Problem:''' When powering fans and drives are spinning up, but I am no hearing a start-up chime and the screen remains black. I am receiving the following LED pattern: LED 4 - off LED 3 - off LED 2 - ON LED 1 - ON I have confirmed that both monitor/panel cables are connected and fully seated. Any ideas?