Chosen Solution
Hi, I have a faulty 23" Apple Cinema HD Display that powers up but no video is shown. However, led power light flashes 3 times. Does the 3 flashes of the power LED indicate the nature of the fault as I can repair if I know what was wrong.
So I’ve found a solution for this issue with the Short / Long / Short blinking sequence (aka “Make sure you are using the correct power adapter with the display”). I’ve found the solution on youtube: http://www.youtube.com/watch?v=aH5xgo1u3… Basically, all you have to do is isolate the middle pins of the symmetric proprietary connector on the power adapter, using scotch tape. I just did it, it worked. Just make sure the pieces of scotch tape are really narrow and cover both middle pins and only these.
leematheruk, check first on what Apple suggest, watch for the blinking sequence :“short, short, short–>The display is detecting wrong video format or an unsupported resolution. Verify that your equipment is compatible and restart the computer. If the issue continues, reset the PRAM. short, long, short –>Make sure you are using the correct power adapter with the display. This alert will only appear on displays built in 2004 or later which require an external power adapter. short, short, long –>The display is detecting a backlight error. Check your display’s power connections and restart the computer. If the problem continues, contact Apple or an Apple Authorized Service Provider. this of course could be caused by failed components on the LCD circuit board. You will have to open it up and take a look at the board, check for burned/broken components. Hope this helps, good luck.
I had the short short long flash and flipping my computer power plug 180° solved it for me.
@davesherry I mean take the power plug out of the wall socket, turn it 180 degrees and put it back, so the live wire is on the other pin.
