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check to see your direct x status by typung dxdiag in run and test if they all pass then I would check the card wattage rating and you max power supply load the card may be to much for your power supply
If you see the line the second the
screen comes on then i have bad news
the L.C.D. has a short to ground in that
row , difficult to repair that problem.
I recomend you take it back to the
place you bought it and Demand a refund
or a replacment . That what I would do.
As far as the detection of your card goes, you need to go to bios setup and check if your 'on board graphics' is enabled, it should be disabled. i can help further if you give your motherboard model number.
the problem with the vertical lines may be that there is dust in your cards PCI socket on your motherboard or the pins on your card might have got damaged when you were cleaning them.
Firstly, start your pc in safe mode (f8) on boot up.
This will start your pc in vga mode, and hopefully the lines are still there, which will indicate a faulty graphics card, if they aren't it may be a problem driver.
If no lines, go to Add/remove programmes and uninstal your graphics driver.
Re boot pc then when it finds your card make sure you point Windows to the folder in which you have saved the driver files.
The driver should then install, see if any change.
You may have to try some older drivers, as Nvidia can be awkward at times.
I have had varying problems with Nvidia and replaced with ATI cards with no problems.
Either your graphics agp slot needs the driver updating or the card itself is faulty, check the agp slot for dust and gently moneuvre the card in the slot to see if the lines appear to change and check that therea are no bent pins in your connecting plug or card.