Solved 2015 Imac Not Booting After Upgrades Imac Intel 27 Retina 5K Display
Chosen Solution I bought a used 2015 iMac with a cracked screen, I installed a 6700k CPU, a blade SSD and SATA HDD with the OWC in-line temp sensor. I de-lidded the CPU and used thermal pads for the GPU, and upon reassembling, it didn’t boot, with no chime and only LED 1&2 lit up. I tried disconnecting both storage drives, put in the original CPU back in, changed RAM and even a different power supply....