If you see the
(vertical?) bars during
<span class="bold">POST</span> or in the
<span class="bold">BIOS setup utility</span> (before Windows starts loading) , it's definitively a hardware issue. You'll have to find out what's wrong, and there are many possible causes :
a bad DVI / VGA cable or monitor, a faulty GPU or video RAM, an inadequate power supply, an overheating GPU, a loose or disconnected cable, etc. If
no line appears during POST or in safe mode, try to rollback your drivers. It not necessarily means that it's a software issue, It could also be a defective component on the video card, a weak voltage / amperage, or a bad connection. Keep in mind that a video card has a very low
<span class="bold">TDP</span> in 2D, and most of the problems will occur in 3D when the card will be drawing much more power and using most of its RAM.
What are your nVidia card, CPU and motherboard, and which version of Windows is installed ? What power supply are you using ? Does it come with 6-pins or 8-pins
<span class="bold">PCI-E connectors</span>, and is it
<span class="bold">80+</span> certified ?
You could try the following to identify the culprit (or ask a friend to assist you) : 1. Check your monitor and its DVI / VGA cable. If the cable is properly attached, try to gently twist it at both ends and check if the bars disappear while you play with the cable. If they disappear completely, it's probably a loose contact inside the cable. In that case, a new cable will fix the problem. I had a similar problem with my laptop, and I fixed it by replacing the internal video cable between the LCD and the GPU.
2. If you have another monitor and DVI / VGA cable, plug them to your computer. If no artifact appears with this setup, you have a faulty monitor or cable. Try with both cables to see if the problem is gone. If no line appears with both cables, the problem could be your monitor.
3. If you only have artifacts while playing 3D games, your video card is probably overheating, defective, or having a power issue. Make sure that your video card is properly seated on the motherboard, and check for any loose or missing connections. Also check if the heatsink of your video card is clogged with dust. A dusty heatsink can lead to overheating, and can be easily cleaned with
<span class="bold">compressed air dusters</span>. At the same time, you can also remove dust from your CPU and your power supply. Make sure that you
never flip the can upside down. If the problem is fixed after cleaning the heatsink, use a benchmark utility like
<span class="bold">Unigine Heaven</span> to see if the video card is stable, and that no artifact appears on your screen during the test.
4. If you have a spare video card, uninstall the current video drivers, replace your video card with the spare one, and install the correct drivers. You could also try with a different power supply if you have one, but make sure it has all the necessary connectors and enough power for the whole system.
5. If your video card is the culprit and it's still under warranty, ask for a new one. If the card was bought at a retail store, ask them for a replacement. Otherwise, you'll have to contact the manufacturer for a
<span class="bold">RMA</span>, or an
Express-RMA if you want to receive your new card faster.
These pages might interest you ▪
Troubleshooting DVI problems ▪
The Lagom LCD monitor test pages ▪
Unigine Heaven