Chosen Solution
Hello, I’ve done some research but haven’t found anything quite the same as my issue. I think there was some kind of power surge & when I try to turn on my iMac, it chimes but the screen stays black. The caps lock button lights up & if I hit the buttons to increase/decrease the volume, it makes the usual noise. The screen stays black but does have white flickering lines sometimes or almost the whole screen sort of flickers white, especially after you press buttons. It’s like it is trying but can’t fully light up. Please help
Try connecting an external monitor to your system to see if the image is clear on it. If it is then the display is having problems, if not then your logic board and/or power supply has issues.
