Computer Monitor Flickers

My computer monitor flickers if we tap it on the side it stops, then starts up again, sometimes we go hours and not problem, other times it drives us nuts, We have a  Gateway computer, it works fine except for this monitor problem, it was purchased in 2004,  it has  a "nvidia GE Force 2 MX 400 video card, I checked with Nvidia and tried downloading the latest driver but then the computer wouldn't start so I had to go back to a previous date so that the computer would start, do I need to look at getting a new monitor? IF so what sort of monitor would be best, someone said the resolution would not be good on a wide screen, but the only ones I have found at Best Buy and other places are the wide screens.   I hope someone can  suggest a solution so we can enjoy this second computer and stop hitting the monitor
thanks Lea

I'm having a similar flickering problem with the LG widescreen LCD monitor which came with our first Vista computer (an HP desktop, purchased about a year after Vista came out).  It mostly only seems to flicker when I'm playing games with animations in the graphics (such as Civilization IV or Astral Masters).  The most common suggestion I found (f.ex. in the HP Help & Support area preinstalled on my computer) was to increase the refresh rate.  Doing this has not eliminated the flickering, but has lessened the severity somewhat (it just flickers as vertical lines or bars at 75hz; at the default of 60hz it flickered as both vertical and horizontal lines).  I ran HP's Monitor Diagnostic Tool (which included a simple wireframe animation), and it didn't turn up any problems.
Hockeycanuckjc's suggestions sound pretty practical, and I'll try them.  I've also seen on another thread on this board that Nvidia graphics cards (my HP computer has an Nvidia Geforce 8500GT) can have issues with the drivers, especially after Windows Vista has just automatically downloaded its latest updates -- so it's possible that the graphics card driver could be getting cranky (though I haven't yet confirmed or denied that theory in regard to my own computer).
I think my HP computer is still covered under its Extended Service Plan (though I'd have to check the sales receipt to be sure), but I want to do as much troubleshooting as I can before calling Best Buy tech support, so I'll be able to explain my problem more knowledgeably, and hopefully not have to jump through as many hoops as usual before they authorize an in-home service call.

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    retchemteach
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