Having problem with display, just started yesterday and have made no recent changes to system leading up to this issue. Computer is a Dell Dimension 4600. Running XP Pro, Service pack 2. Display is a Dell 1800FP. Video card is NVIDIA GeForce FX5200. Display is frequently and somewhat randomly blinking out and then coming back within a couple seconds. Occasionally seems to be correlated to mouse use, but other times not. Happening while using different programs (IE, Outlook, Windows, Quicken, while typing this forum post). Need advice on where and how to start looking for cause. Video board? PC power supply? Thanks in advance for suggestions.