What type of connection are you using for your monitor? Is it VGA (RGB)? If so, the most likely culprit is either the VGA cable, or one of the connections at either end. The blue tint is the result of a missing color (either Red or Green). Try checking the connections at both ends of the cable (monitor and graphics card), if you can't find a loose connection, you'll have to try a different cable. If this doesn't fix it, it could be something wrong with the video connector. You didn't mention what your new graphics card is, but if you are using VGA, it's a good bet that you are also using a DVI - VGA adapter. If so the adapter is possibly the source of the problem.