New MacBook connected to external VGA display screen flash.

same problem: xx841xxxxxx

I googled if someone has the same problem like me, and I found out that it is a general problem with the macbooks!

I have a 2GHz Macbook 13" Alu and I am using a Acer 20" Display with the dvi-mini to VGA adapter.

First I thought it is the energy save modus in the system preferences. so is there a solution available??

If any of this has already been mentioned, my apologies.

Has anyone read this page yet?

http://getsatisfaction.com/apple/topics/macbookexternal_monitor_locked_in_unusable_flicker_after_monitorsleep

To summarize:
It claims the issue is caused by the macbook going to sleep. Once it wakes up the external monitor begins it's flickering issue. It can be resolved for the time being by unplugging and plugging back in the external monitor to the macbook.

Also, they claim a shortcut of CTRL SHIFTEJECT can be used to reset the monitor and thus avoid the unplug/plug action.

It can also be avoided entirely (supposedly) by disabling sleep for the display as someone may have already mentioned in this topic.

Possible solution?

I installed SwitchResX to see if I could try some "unsupported" refresh rates. After installing, I am still using the 1680x1050 60Hz setting, but I have not had any screen flashes for two days. I have never gone this long without the annoying flashes before.

I noticed now that there are two entries on my "Displays" preferences for 1680x1050. They appear to be identical, but as I said before, my flashing appears to have disappeared!

John

same problem with a samsung t220 (22 inches) at 1680 x 1050
With a lower resolution, no problem. With other monitors, no problem.
mine is 846.
After knowing that in lower resolution it works well, it's obvious that the auto source scan of the monitor cannot be the reason of the problem. It makes sense the idea of the power administrator of the nvidia card...

VGA Adapter doesn't work with my Samsung 37" LCD. LN37A450

Called Apple. They sent a replacement adapter still doesn't work. Samsung LCD doesn't recognize that the MacBook is even connected. Tried the MacBook with a friend's Vizio and had absolutely no problems.

No idea what the problem is. Possibly a Samsung issue. Either way this is ridiculous.

disabling sleep does nothing to change it for me. the flashing happens long before sleep would be activated, and without the monitor ever going to sleep first. it must be a different issue.

I have your issue which someone put into a youtube video.
http://www.youtube.com/watch?v=u-dQIgfIFsI

I'm deep into the bowels of Apple tech support. They are looking at the problem, no fix yet...

I have a 13.3 MacBook. Everything works fine at the office running an external Samsung 244T using the DVI link as the only screen. A different Samsung 244T monitor will not work in this mode using a DVI Link at home. Instead I have to use a Samsung 226W using the analog connector (nothing with the DVI connector), and am getting the random flashing off everyone is reporting (Although this never seems to happen with the screensaver going for hours, I noticed). I am now in he process of swapping out cables and connectors, since on the face of it, the outboard parts of my home and office set up should be the same. And, yes, this used to work fine with my black plastic macbook. What gives: Can't we get a response on this??

Two questions:
1. Has anyone successfully connected a 2.4 GHz MacBook to an external monitor using either DVI or VGA at a resolution HIGHER than 1280 X 800, preferably 1920 X 1200.

2. Are people also having problems with the connection of their 2.4 GHz MacBook with an Apple Cinema display at these higher resolutions?

I appreciate your help. This is very frustrating indeed.

Since two days I have my MacBook unibody (2.0) running with a Samsung Syncmaster 2032MW LCD-TV. It was not running with the VGA connector although it did show the Syncmaster in the System Profiler.
I got a tip on a dutch forum that DVI did work, ...... and YES!!! No problems so far with the minidisplay port adapter and a DVI - M single cable.

me too - tried switching graphics cards using energy saver - on off on off flickr bounce - ahhhh not cool - plus issues with trackpad and sleep making me wish I hadn't upgraded so quickly. Feel free to send me free stuff Apple.

Thought I'd just fixed this by switching to better battery life in energy saver control panel and turning off [automatically reduce the brightness of the display before display sleep]

BUT

just started happening again - darn

Message was edited by: matthewpack

I am having the same problems here. Using SAMSUNG SyncMaster 245B, and it has trouble finding the screen initially, and then I have the intermittent off then on again image on the screen. Hoping for a fix soon.

Same, same here. Purchased new MacBook yesterday with VGA plug....will not work at all with two different LCD TVs which work fine with my 18 month old MacBook Pro which is, BTW, in the shop for 5+ weeks supposedly getting its NVidia chip replaced!

This puppy goes back tomorrow for a full refund, I have no patience for going through what people in this thread have gone through.

Have always bought Apple because it JUST WORKS. That doesn't appear to be the case anymore. If I wanted this sort of grief, I would have bought a Vista machine....