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Monitor displays patterns and then goes black. What could it be?

Three times in the last hour the monitor went black. Most times just everything dissappears at once and it is black.
The little light beside the on/off switch, however, is still on orange - which means that there is still power.
The last time it was a bit different. For a few seconds there were systematically arranged rectangels on the screen. Columns of about 5 cm breadth each, the first column coloured, the second not (you could still see the normal content of the screen), the third coloured again, the fourth like the second and so on. Within the columns there were rectangles like in a table, each about1-2 cm high. Again one was coloured, the next you not, then coloured again, then not, and so on. It looked quite fantastic and well organized! After a few seconds it dissappeared. I have seen these rectangles several times before, but as I said, usually the screen just goes blank at once.

I have replaced the Monitor with a new one. Whate else could it be and how do I test for it?
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davistev
Asked:
davistev
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1 Solution
 
HypercubeTechCommented:
Replace the video card. That is a common symptom of a bad video card.

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davistevAuthor Commented:
But my video card is built in to the motherboard. If I install a seperate card - does this override the motherboard settings?  The computer is only 8 weeks old.

Would a power surge cause this type of problem? I ask as my computer is connected directly to the power mains without going through an UPS first.

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ridCommented:
Can you see anything at all on the monitor, like POST screen at bootup? Does it blackout after some time or more or less directly? This may be a heat problem with the video processor. Its heatsink may have come loose, or the fan (if there is one) can be broken.

With a new machine, I'd strongly recommend you return it. There may be more underlying problems in it that you don't want to bother with.
/RID
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davistevAuthor Commented:
The boot up is normal. The problem is random.
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davistevAuthor Commented:
Actually, is there a piece of diagnostic software I could download to test these hardware components?
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ridCommented:
If you're using windows, run safe mode and see if the problem is still there.
/RID
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mysticaldanCommented:
Disable the onbaord video card by setting its memry use to 0 mb from its current 2,4,8,16,32,64 mb whatever it is right now. If it has an option of disablinbg onboard video then do that and install an external video card.

SiSoft Sandra is a great free utility for burnin testing and configuration and u can use it to test ur graphics software and see if u have any other problems http://www.sisoftware.net/

You can also use 3Dmark and see if it runbs properly. On a bad video card it will certainly give problems : http://www.futuremark.com/products/3dmark03/

Dan
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HypercubeTechCommented:
Most motherboards automatically detect the added in card.. Insert the other video card, plug in the monitor and you should be good to go.
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