I have a 2010 21.5 iMac. During the boot-up I hear the chime and the fan is working but there's no display, only a black screen.
I have tried the usual fixes (reset parameters, etc) but it doesn't make a difference. I have connected to a new iMac and tried the target disk mode, however that doesn't help.
I am wondering if it could be a logic board issue?
Is there something else I can check or other troubleshooting I can do?