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Windows 7: External monitor blinks/flickers

28 May 2010   #1

Windows 7 x64
External monitor blinks/flickers

Hi all!

I have no idea what happened, but my external display started flickering. It gets dark for about a second or two and it displays contents for a fraction of a second, going dark again. Also, the display is covered with dancing static-like colourful dots when it stabilises for a few seconds (rare). Sometimes it even enters the power saving mode. The monitor is completely useless. Playing around, I discovered that the effect disappears when I'm using 800x600 or 1024x768 resolution. With such low res, display works fine, but since it's a 1920x1080 screen... it's hardly any point in keeping it on the low.

I have a macbook running win7-64, connection is VGA with minidisplay port adapter. Since low res works, it can't be the cables nor the adapter.

No system restore point. Latest drivers, etc... what might be wrong and how could I fix it?

Edit: Plugging the laptop power cord doesn't help.

My System SpecsSystem Spec
28 May 2010   #2

Windows 7 Professional SP1 - x64 [Non-UEFI Boot]

You might have to wait a little that some that got Boot Camp with W7 on Mac can give you a reliable answer.
My System SpecsSystem Spec
28 May 2010   #3

Windows 7 Ultimate 64bit

maybe a limitation with the adapter choosing a correct refresh rate for the monitor at 1920x1080.
My System SpecsSystem Spec

05 Jan 2012   #4

Windows 7 64-bit

You probably already found a solution for the problem, but, if not, here's whats up with me.

I have a 1366x768 internal monitor and a 1680x1050 external monitor. When I got it I was using a VGA to VGA cable. My father recently got a DVI to HDMI cable. Currently when the external monitor is not in use it flickers for 1 to 2 seconds once every minute. When the monitor is in use it does not flicker.

Thus, I would try using a different cable, if possible. However, I cannot provide you with a solution or reason to the problem with your current setup and I am very, very curious as to why this is happening with me and you.
My System SpecsSystem Spec
06 Jan 2012   #5

Windows 7 x64

Thanks for the reply, but I don't actually know whether it was indeed the knockoff cable issue. Bought a DVI knockoff instead, and it worked flawlessly.
My System SpecsSystem Spec
30 Jan 2012   #6

windows 7 home premium 64bit
same prob with acer

have an acer laptop have had it for about a year now and i have allways hade the external moniter hooked up but last friday it started flickering tried sistem restore resolution and different moniter soooo up set dont know what to do itis windows 7 using vga port i get flickering but hdmi i dont nothing rong with drivers and i tried a different moniter still there on the ohter one is it my card and if so how do i fix it need some help pleese

ps sorry for the spelling

also the moniter is a sansui tv that has a vga,hdmi ports on it
dont know if it is a software issue bercause i did the sistem re store and it didnt make a difference pleesseeee help me i need the second moniter and if i dont have it its really hard to work on auto cad for high school

pleese reply and help me get my moniter back

the desplay card that came with it is still in it i havent taken it apart because i dont know that yet

here is the stuff i can pull up on the card: amd radeon hd 6250 graphics
hope this is all the info needed im kinda new to this
My System SpecsSystem Spec
31 Jan 2012   #7

Windows 7 x64

Did you try 800x600 resolution like I did? Did you try a different cable? Did you try the HDMI port?
My System SpecsSystem Spec

 External monitor blinks/flickers

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