Rear View Part Number: 2906029RGateway GM5688E Desktop Computer Model: GM5688E This is the rear of the computer. Refer to the following table for more information. Item Description A Voltage switch B AC power connector C Rear ports D Four add-in card slots The number and types of cards may vary from those shown. E Two side panel thumbscrews F Certificate of Authenticity (COA) label Provides the product identification number for the Microsoft® Windows® operating system originally installed on the hard drive. G Rear vent Do not block this vent. H IR blaster and receiver jacks