Rear View       Show Part Numbers       Hide Part Numbers 1015456R, 1015572R, 2906025R, 2906026R, 2906053R, 2906063R       Show Model(s)       Hide Models GT5650j, DX442X, DX442B, DX442S, DX442XP 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 Side panel thumbscrew 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 fan vent. Do not block this vent.