My Dell Monitor suddenly started jittering while I was playing a computer game. This is the first time it has ever done this, and I did not make any changes at all to my computer, it just instantly started jittering. I have no speakers near my computer, I use a headset.

I have moved my computer to a different outlet on the side of the room, it still jitters.
I have moved the monitor and connected it to another computer and there were no jitters. I attached a different monitor to my computer and it started jittering, even with different connecting cables.

So it is something in my computer causing it. What is it though?

I have a NVIDIA GeForce 7300 LE Graphics Card, that I updated right after the screen started jittering. It didn't change anything.
There is no demagnitize option on my computer, it is a flat screen.

Please help. The jitters are constant. :confused:

It doesn't have to be just speakers sitting near it that can cause interference, it can be just about anything electrical. Try clearing out anything else that is electrical and see if that changes anything.

If that is definitely not it, try changing your screen resolution up or down, or change the refresh rate and see if fiddling with that changes anything.