Dell XPS 420 1-3-4 error code.

My computer a couple days ago wouldn't boot up and go to the Dell Splash screen and got a 1-3-4 diagnostic code.  I only bought a 1 year warranty and that expired (I know foolish) and they recommended purchasing replacement sticks of memory.  I got the sticks today and replaced the memory and am still getting the error.  It powers up fine but I'm guessing the system board is shot?