iMac A1418 Black Screen 3 led On but 1 Off
After changing the disk on the SSD, a gray vertical bar appeared on my screen.After the next opening I had a few colored vertical stripes on the screen.I opened it again and I drank the tape on the power and plugged in. Now the screen is black. Make it start (dong ) there is a fan but no image. On the main board only 3 LEDs are light but the last 4 Led is off. Where do you look for a problem?