Computer monitors are one of the most important devices on a computer. Without display information, how can you be certain of what you're doing? Troubleshooting requires checking a few steps to see if the solution is a simple one. Sometimes the solution goes far beyond your expertise and requires a computer monitor repair person to help you out.
Check to see if there are any faults in the AC power plug. Check the plug's connection to the power outlet to make sure that it isn't the outlet causing the problem. Check the plug's connection to the monitor to make sure that a loose plug isn't the issue.
Check the VGA cable for any problems. It is usually smart to unplug the cable and check the connectors inside the cable to make sure that everything is in proper order. After checking the monitor end, check the video card end that plugs into your computer.
Try using the monitor on another computer if it continues to flash and act up. This will clearly denote if the problem is with your computer or with the monitor. If the monitor works on another computer, the computer is the problem. If the monitor doesn't work on another computer. the monitor is the problem.
Update your video card drivers. This can answer some problems that might come from the video card instead of the monitor.
Call the manufacturer of the monitor if the problem persists, or call a computer repair shop. This should be the last and final step in the troubleshooting process. There might be a problem with some electrical configuration or core components that is best left to an expert.
Leave the monitor unplugged for a while and see if this helps with the problem.
A virus can also be responsible for a blinking computer screen.