Either your video card on the motherboard is bad or you have not correctly installed the motherboard drivers to your pc or laptop as this being said make sure you have connected this item correctly and make sure you didn't bend any pins on the monitor pluug... test monitor on a different computer if it still does the same thing its your monitor.
Answers & Comments
Either your video card on the motherboard is bad or you have not correctly installed the motherboard drivers to your pc or laptop as this being said make sure you have connected this item correctly and make sure you didn't bend any pins on the monitor pluug... test monitor on a different computer if it still does the same thing its your monitor.