I have a Dell XPS600 that shut down out of the blue and will not power back up. The power LED blinks yellow. No noise at all is heard when trying to power up (eg no fan noise, or hard drive spinning). No other lights come on either (eg hard drive LED not lighting up). Computer out of warranty. Based on Dell site troubleshooting seems like it's a dead power supply. Do you agree that best option is to order power supply and replace? or is there something else you would recommend?