I'm having same issues with the Acer monitors myself...
Check if the monitor is plugged on the video card tightly and well screwed close, and do an auto config on the monitor.
Mine did go blurry too....
This may seem stupid, but I went and use air can and just blew it on the plug, and tightly attached the plug again to the video card, and did the auto config and walla (typo?) ....