You seem to be using 'ancient' stuff (both videocard and monitor)
May we assume that you did not have the problem with the previous monitor?
Are you using the same resolution as with your previous monitor; if not, try that first.
How much video memory does your card have?
What happens when the software crashes
I don't think it has something to do with the monitor as that is basically a passive device; I think that you're running into limitations of your system.