more info is needed
LCD/TFT don't 'flicker' per say, however, the older CRT monitors can and do flicker, especially if you have the wrong screen resolution.
What is the operating system ?
What monitor ?
What is the graphics card ? ...
may not be monitor at all
Are all drivers up to date ?
Desktop or laptop system ?
Make model of system ?
Bank details, nat ins num, address and a current bill to prove you are who you say your not.
Well, OK, maybe not the last one, but the other info will help us better to help you.