it's your graphics card

I had the same problem and so have others.
First what you have to do is find out what make of card your graphics card is and then type it into a search engine, e.g google.com, along with "driver updates".
For example "ATI Radeon X1050 driver updates"
download the driver update which will be free and run the aplication to apply the update.
Sometimes this solves the problem but if it doesn't then unfortunately you need a new card
