I have a dell GX620 with Windows XP installed and a Dell monitor. For reasons unknown, the screen just blinks to black for a few seconds and then it comes back. This is most annoying and I can't seem to find out the cause. The video is on the mother board. I've updated the driver, reinstalled the driver nothing is working. In addition this user had his command prompt to full screen but I went into the properties and put that back to small screen - this still maybe my issue. This also happens in safe mode. I have downloaded and installed all of windows updates too. Its almost like the screen is readjusting its picture. Has anyone ever encountered this? Also is there a registry setting for the command prompt to check incase that's still my issue?