Q: Macbook Pro External Monitor Keeps flickering every few seconds

I have a 13" MBP of June, 2012 model, and use moshi Mini Display/Thunderbolt to HDMI adapter to connect to an ACER LCD monitor.

The external monitor worked fine until one day, the monitor started flickering every a few seconds and some times every a few minutes.

I tried it with both lid closed, lid open, or Mirror and non-Mirror, the same problem. Sometimes the flicker is shorter - almost like a blink; sometimes, the flicker is longer - a complete blackout and then 1 or 2 second later come back.

What should I do? What could have caused it? Thanks!

MacBook Pro, Mac OS X (10.7.4)

Posted on Aug 30, 2012 2:26 PM

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Q: Macbook Pro External Monitor Keeps flickering every few seconds

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by sanjampet,

sanjampet Aug 30, 2012 2:59 PM in response to tmegirl
Level 5 (7,874 points)

Aug 30, 2012 2:59 PM in response to tmegirl

Try a PRAM reset:

leave the external monitor connected and powered up. Power off your Mac, Hold down the keys option, command,P,R (no commas).
Power up the Mac press these keys before thestart up chime, hold them till it chimes 2 times then release.

See if this helps.
All the best
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by tmegirl,

tmegirl Sep 5, 2012 1:39 PM in response to sanjampet
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Sep 5, 2012 1:39 PM in response to sanjampet

Thanks for the feedback. I have tried the PRAM reset procedure as you suggested. But it did not work.

Anything else I should do?
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by sanjampet,

sanjampet Sep 5, 2012 3:30 PM in response to tmegirl
Level 5 (7,874 points)

Sep 5, 2012 3:30 PM in response to tmegirl

After the PRAM reset did you reboot the MBP and the projector?

If not, connect and power up the projector, the power up MBP.

The monitor itself could be on the way out, is there another monitor you can check it on.

Another thing you can try is a VGA cable with the DVI adapter and see if that performs better.

You can also try a different cable, since it worked fine in the past, I'm just trying to help you.

check some of these out:

http://support.apple.com/kb/TS4045

http://support.apple.com/kb/HT3382

http://support.apple.com/kb/PH7342

http://support.apple.com/kb/PH7219

I hope you can find something here, it's hard to source problems when the device(s) are not in front of you.

Let me know how this works for you,

All the best
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Q: Macbook Pro External Monitor Keeps flickering every few seconds

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by sanjampet,

by tmegirl,

by sanjampet,

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