Siemens 6AG4112-0AA21-0BX3 Simatic Rack PC 647B w/ Rack Mounting Ears, 80GB HDD, 1GB RAM, Windows XP Pro, Used-Item Initially Powered On When Connected To Power But After Approximately 1 Minute Of Being On We Heard A Loud “Pop” Sound Which Caused The Unit To Power Off And Has Not Turned On Again-Fuse Is Still Good And No Obviously Visible Faults But Likely The Power Supply Needs To Be Replaced-Plastic CD Cover Plate Cracked and Loose-Not Tested Further So Listed For Parts/Repairs or Not Working-See Pictures