There were no black areas on the screen previously so I've ordered a backlight board and a Mini DP cable to help trouble shooting. So I think I'm down to it being the back light LEDs all going simultaneously or the LED Backlight board. I'm happy its not a Hard drive or GPU issue. It wouldnt be so bad, but he does it regardless of what. (since this post started, I have formatted the hard drive and the iMac boots up properly now) To counter the negativity, we have rounded up the funniest Free desktop images and screen savers. Connect to the internet Browse the web Adjust the volume Take a screenshot or screen recording View and edit files with Quick Look Jot a Quick Note Set up Screen Time for yourself Set up a Focus to stay on task Edit photos and. then after 1min 5secs the imac shuts down and all diagnostic LEDs go out! Menu bar Spotlight Control Center Siri Notification Center Desktop Dock Finder Basics. Activate power-saving mode or a moving-picture screen saver if you will not be. īut then there's no back light, when shining a torch I can see the apple logo and the bootup progress bar This symbol alerts you that important literature concerning operation. Ive spent hundreds of hours researching into the sleep literature for clients.

So all hardware diagnostics passed (?!?!?). This will open a new window that looks similar to Explorer in Windows. When the power socket is turned on I get No1 LED diagnostic light on the mother boardĨ seconds after pressing the power button (a faint flash) I get the start up chime followed by the other 3 LEDs I have placed the correct brand new PRAM battery in I know my iMac is old and this looks like a common problem.

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