ViewSonic VA721 User Guide - Page 17

Troubleshooting No power • Make sure power button (or switch) is ON. • Make sure A/C power cord is securely connected to the LCD dislay. • Plug another electrical device (like a radio) into the power outlet to verify that the outlet is supplying proper voltage. Power is ON but no screen image • Make sure the video cable supplied with the LCD dislay 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 dislay, tightly secure it to the LCD dislay. • Adjust brightness and contrast. • If you are using an Macintosh older than G3, you need a Macintosh adapter. Wrong or abnormal colors • If any colors (red, green, or blue) are missing, check the video cable to make sure it is securely connected. Loose or broken pins in the cable connector could cause an improper connection. • Connect the LCD dislay to another computer. • If you have an older graphics card, contact ViewSonic® for a non-DDC adapter. Control buttons do not work • Press only one button at a time. ViewSonic VA721 16