Hello, I have a Dell xps 420. I did the dell pc check up and the results stated : memory address test, memory low bit test, and memory checkerboard test - all failed, contact dell. When I contacted them I was told the motherboard and RAM were faulty and needed replaced at a hefty$264 for the mobo. Are they correct? My system is still usuable and boots up. I am encountering issues with some of my programs though. Can you offer any advice?