Like any laptop owner, the screen on your Macbook, Sony, HP, Toshiba, or whatever laptop you have is often too small for one task or another, which means you will eventually want to plug it into an external monitor. More often that not, when a laptop is connected to an external monitor it will display a blurry, fuzzy, stretched (the edges are cut off) or otherwise screen. Recently I had this problem with a MacBook Pro, and Acer, and a Sony Viao Laptop, and each had a different solution which I hope can help you with your screen issues. The solutions are ordered easiest to more difficult (and costly).
1.) For any screen issues you have it is best to first check your cable connections to both the laptop and screen. Loose connections can cause lines, blurriness, and other visual artifacts on the screen. Make sure the cables are completely pushed into the connectors and don’t wiggle around.
2.) Blurry, Fuzzy Screen – On Windows, right click on the desktop and choose “Screen Resolution”. In the drop down box entitled “Resolution:” make sure it is selecting the “Recommended” screen resolution, usually 1920×1080 for bigger external screens. You may want to try several different resolutions if 1920×1080 is not an option. The higher the resolution, the more clear and smaller items will appear on screen.
3.) Lines Appear Onscreen In Waves – This is usually caused by noise from the power supply. Check to make sure your cables connecting the screen to the laptop are not near power cables. Try unplugging the power cable from the laptop, do the waves disappear? If so, skip to step 4.
4.) If the above steps have not solved your problem it is best to try another connection to the screen. If you are using a VGA cable, try a DVI or HDMI connection to the screen. VGA is an analog signal, whereas DVI and HDMI are digital, and such noise should not affect the picture quality. In the case of my MacBook Pro, I purchased a 3rd party cable that was supposed to have gone from display port to HDMI directly (and for $8), but it didn’t fit my screen correctly, it was cut off on all sides. I ended up purchasing (see photo below) the official Apple Mini DisplayPort to DVI Adapter MB570Z/A, and the Cables Unlimited HDMI to DVI Cable which solved the problem perfectly. The Sony Viao needed the same Cables Unlimited HDMI to DVI Cable to solve the fuzzy screen problem (see the photo below).
If the simple screen resolution settings in Windows XP/7 or Mac OS do not work, switching cables often seems to be the best remedy. Be sure to check for updates for your graphics card and adjust settings inside the graphics card software if the colors or contrast are off. If you are still having problems, leave a comment below, or send Plazor an email and we’ll be happy to try and assist you.