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DELL™ OPTIPLEX™ 990 TECHNICAL GUIDEBOOK —VERSION 1. harga nb 990 5 5 DESKTOP COMPUTER (DT) VIEW FRONT VIEW 1 Optical Drive 5 Microphone Connector 2 Optical Drive Eject Button 6 Headphone Connector 3 Power Button, Power Light 7 Drive Activity Light 4 USB Connectors (4) 8 Diagnostic Lights (4)