Starts Up to Black Screen or No Video (iMac
Refer to Knowledge Base article 303870 or follow the procedure below.
An iMac
1.Shut down the computer by pressing and holding the power button on the back of the iMac until it turns off.
2.Reset the NVRAM. The computer should display a grey screen, then start normally.
3.To prevent it from happening again, update the system software to Mac OS X 10.4.8 .The update will require that you restart your computer after installing.
Note: If you choose not to install the Mac OS X 10.4.8 software update, the following steps will also prevent the issue from occurring again:
1.From the Apple menu, choose System Preferences.
2.Choose the Displays pane of System Preferences.
3.Temporarily select a resolution other than the 1440 x 900 native resolution.
4.Switch back to your preferred resolution and close System Preferences.
Display is tinted another color.
1.Reset the parameter RAM. Press the
Does the computer display video after successfully resetting the computer’s PRAM? Yes: Problem resolved. Restart the computer from the Apple menu and make sure the computer display is no longer tinted another color.
No: Continue to the next step.
2.Connect an external monitor to the
Yes: Replace the logic board.
No: Check the LVDS cable connection. If connected and same color tinting persists, replace the LVDS cable. Does color tinting persist after changing the LVDS cable?
Yes: Replace the LCD display panel.
No: Problem solved. Restart the computer from the Apple menu and make sure the computer display is no longer tinted another color.
iMac