Display not working on running iMac
I just made a OS-service-update, after that disconnected the iMac and carried it downstairs to another room.
When booting, the display had stopped working.
When booting, it seems as if she starts, shuts of, and starts again.
External HD, wi-fi keyboard/mouse all signal that they are operational when iMac is turned on. Inside, there seem to be some slow "cycling" going on.
I see no hidden images when shining with a flashlight.
Could it be that something got loose inside when I carried her? I don't recall being very insensitive when doing so.
Any ideas on what need to be done?
Also, I have tried starting in safemode and all the other keyboard-combinations, the screen is just completely out.