|Not nearly enough info. Please post the make/model of the monitor, the graphics card, & the TV tuner card so we have an idea what you're working with.|
Were you using a CRT monitor before upgrading to the LCD? If you were, was everything working OK with the old monitor? What's an "mx 4400" - do you mean MX 440 or MX 4000? Whichever it is, it's an old/outdated card. Are you using the VGA port or DVI (if it even has one)? Are any adapters involved? Did you set the screen resolution to the native resolution of the new monitor?
You probably should have asked in the hardware forum.