Line Of Red Dots Only Appears On Dark Background

Oct 23, 2012

When I start my PC up a line of red dots appears across the monitor screen at the bottom of it. The line of dots again appears but higher up the screen when the windows screen appears. Both screens are dark in colour. Also if I have a block of dark colour anywhere with a light coloured background about 3 or 4 lines (each line directly above the other) of red dots appear across most of this block of a dark colour but none in the light coloured background. In all cases the red dots do not form a continuous line across the screen. My pc has an Intel i5 3570k processor running at 3.4GHz (not over clocked) with onboard intel HD4000 graphics. I do not have a separate graphics card.

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When the computer is loading, the screen stays black. Then when my desktop would normally show is when the pixels show up and the rest of the screen is black.

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I recently purchased a computer in Sept 2012 from Dino PC in the UK where I live. It has been running very well apart from an irritating red dot problem. My pc has an Intel i5 3570k processor (not over clocked) which has no additional graphics card and runs using the on board graphics HD 4000. I don't play computer games. I have connected my monitor (a Hanns G HG 216D) to another computer to check that my monitor or cables were not at fault and the lines of red dots do not appear.

I have my monitor connected to the pc with a VGA cable but I have also connected my monitor to my pc with 2 different HDMI cables and the red dots still appear. I have also connected my pc to a tv to use as a monitor with a different HDMI cable and the red dots still appear. These red dots didn't appear immediately when I first had the pc. I believe that they began to appear once I started updating my pc with the latest windows 7 updates (x64 bit).

The red dots appear horizontally across the monitor screen each time I switch on the pc at the very bottom edge of the screen (in small columns) then when the Asus screen appears (motherboard is Asus p8z77-V LX) in a single line horizontally across the middle of the screen, then again in a single line horizontally when the windows 7 start up screen appears. They then appear again if I have an image in the centre of the screen which is a dark block.

In this case they are grouped together in a horizontal block about 4 dots high and about 30 dots wide to the centre right of the dark area. The line of dots only appears horizontally and in red on dark screens. Occasionally I have seen the same lines of dots on a light coloured block in the centre right of the screen when the dots are pale blue and in the same formation. If I move the mouse over the red dots when they appear in a centre block of a dark colour the red dots momentarily disappear.

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If I kill power, then boot again I get an offer for Windows to repair itself. If I let it, it cannot repair. If I select Boot Windows Normally, all is well. Except for this one problem, things are really running well. Odd. I've run Chkdsk, SFC/ SCANNOW, and PC Pitstop Optimize3. Nothing finds a problem or fixes anything.

System Info Utility version 1.0.0.1
OS Version: Microsoft Windows 7 Home Premium , Service Pack 1, 64 bit
Processor: Intel(R) Core(TM) i7 CPU 965 @ 3.20GHz, Intel64 Family 6 Model 26 Stepping 4
Processor Count: 8
RAM: 12279 Mb
Graphics Card: ATI Radeon HD 4870 X2 , 1024 Mb
Hard Drives: C: Total - 953766 MB, Free - 875155 MB; D: Total - 953866 MB, Free - 824991 MB;
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Avast/Comodo

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I have attached my DxDiag results.

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