Hello Howdy_hank, I understand that when you mentioned that your monitor is cutting out, it actually means flicker. Please let me know if this is correct?
This behavior seems to be a cable situation. Since the system is working fine when using the DVI to VGA cable.
It does not seem to be an issue related to the graphics controller.
I would recommend you to get another DVI to HDMI cable and test it on your monitor.
thanks for getting back to me, I have tried a new cable and the effect is the same. However, recently the problem seemed to have diminished greatly with no real sign of the problem, but I have installed the new version of flash this morning and now it is back, almost all of the time, the screen keeps cutting out every 10 seconds, for about 1-5 seconds and it is very hard to get anything done. It does seem to be worse when something is moving on the screen, such as scrolling pages or a gif is playing.