4 diagnostic leds are on, but no boot chime or picture on the screen
If I turn on the iMac, all four leds are on, but I hear no boot chime. The screen flashes a single time white and that’s it. I have connected the iMac with an external display, but nothing appears on the external screen.
I know for sure that the speakers work, because the iMac beeps if I remove the ram.
Can somebody explain me what’s wrong with the iMac or does anybody have a suggestion that might fix my iMac?
Ist dies eine gute Frage?