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Re: viewsonic va721 monitor
Connect the monitor to a different computer system (if available) to see if the issue is with the video card or the monitor.
Make sure A/C power cord is securely connected to the LCD display.
Make sure the video cable supplied with the LCD display is tightly secured to the video
output port on the back of the computer. If the other end of the video cable is not attached
permanently to the LCD display, tightly secure it to the LCD display.
Your backlight may be going bad, or the small controller board may be going bad also.
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If you have not updated the graph drivers, and it has been working, then you should contact View-sonic, go to their website, check warranty, but if you didn't change anything, it should be the monitor having problems. Did you check the plugs on the PC and monitor, the power plug on the monitor, make sure they are connected right and didn't come lose.
this is only an educated guess based on my years of computer and electrinics experiance. I believe the problem is the AC inverter that supplies current to the monitors back light,it powers up and fails. the monitor is working but without the back light you get a blank screen.The problem is fixable, but the delema is that for a technician to troubleshoot and repair the problem may cost as much as replacing the monitor since the prices have dropped so much in the last few years.