Resitting the ram means to take it out and put it back in,
hoping it will fit securly.
Sometimes a bad hardware will cause the system to hang.
If you have more than one piece of ram, put one piece in and
play the game, if it hangs, take out that piece and try another
piece, if it still hangs, ram may not be the problem.
Then you can resitting the graphics card, or test it with
another card to try.
Sometimes dignostics can be done at home, as long as you
have extra compatible parts