Chosen Solution
Hi everyone, I just open up my iMac after I have issues this morning. I noticed that LED #1, LED #2 are on, then LED #3, #4 , #5 are off. The fan starts and blow cold air and after it becomes hotter. Naturally, screen is dark and no sound becomes. Just someday before I upgrade my Fusion Drive set with 250 GB of blade SSD and 500 GB of SSD standard, then I max out my 8 GB 2400Mhz DDR4 Memory with 32 GB 2400Mhz DDR4 by Crucial. What is the meaning of the LED #3 off? LP
The logic board is not communicating with the GPU. Hook up an external monitor to test.
