A few days ago my Dell desktop started this issue. The display on the monitor flashes on and off. I can open the task bar and it does not flash on and off when the rest of the display does. I can not open the control panel. I haven't recently made any changes or updates on the computer. I did install HR Block to do my taxes, but uninstalled that thinking that may be the issue. Still having the same issue. I've tried putting it in safe mode and restarting it, still nothing changes. I need help!! Thanks!