hi,
i have imac 22" 2010
i have black screen during chime and os load, after os is fully loaded then screen turns on and everything runs fine, same on external monitor.
i cannot run recovery or hardware test because screen is black
iPhoto '11
Hi meckyno,
Welcome to the Apple Support Communities! I'm sorry to hear you are having these issues with your Mac. If you are having issues with a black screen on startup, you may find the troubleshooting steps outlined in the following articles helpful. In particular, you may want to test with the external display disconnected and see if the issue persists:
If your Mac won't turn on - Apple Support
Get help with video issues on external displays connected to your Mac - Apple Support
Regards
screen turn on only after full boot
