My new Apple 20" monitor keeps turning itself off and on while in use. The screen goes black, then comes on again.
The cables are all installed correctly.
I noticed the LED flashed 3 times recently (short short short) and so reset the PRAM according to the instructions on the Apple website. But no, the problem persists.
I also attached a surge protector, but that doesn't help either.
How old is your monitor?
SOURCE: Apple 20" display black screen
I've read that aftermarket DVI cable adapters don't work well with this set-up. You might try the Apple DVI to ADC adapter. It's expensive but I see them on eBay or craigslist from time to time at less than half the normal $99 cost.
SOURCE: Apple Cinema Display 23" LED short-long-short flash prob.
Hello, I had the "short long short" blinking led problem with my 23" ACD after a power outage which left my screen blank and my cheek wet with a tear for my baby. I read somewhere that a guy was getting a 1 volt reading on the middle pin of his damaged 90 watt power block. I figured maybe the display might work if I could somehow block the middle pin. So I cut a small strip of paper wide enough to block just the middle pin and long enough to cover both sides, folded it to look like a "W" from the side. I then carefully pressed it into the brick receptacle with a toothpick leaving just a little slack so it would not tear when I pushed in the small white plug. It was a bit of a tight fit but guess what. IT WORKED! I am now enjoying my beloved monitor anew and saved $$$ on replacement brick or repair. If you want to try it and you feel you’ve nothing to lose, make sure you cover just the middle pin (both sides) and you may have to try a couple of times. It worked for me. I hope you have good luck too. Regards, Moozler
edit December 2016. Still working after 7 years.
***CAVEAT AND WARNING***
Use this fix at your own risk.
A faulty voltage regulator is probably the cause of failure. Voltage regulators can start a fire if too much voltage is applied.
Bud Martin's post below describes the electronic component failure that causes this problem. Thank you Bud.
SOURCE: Apple Cinema display goes BLACK after start-up
My G4 has a ADC & VGA on the same card. The VGA works but the ADC, is doing the same thing as you described. I am searching the web, and can not find an answer to this problem. George 3/21/2010
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My son and I each have an Apple 20" Flat-Panel TFT-LCD Cinema Display monitor. I experienced the the problem of a bleck screen first. When checking the net for a solutions it was suggested I purchase another power brick which I did from an online source about a year ago. Switching the power cube when the monitor blacked out worked so I ended up alternating the power cubes frequently. Recently my son's monitor started acting up the same way. We ended up alternating our three power cubes. It seemed that resting the cube a bit seemed to work. Now we have the problem that none of the three cubes are working for us leaving us with two useless monitors.
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