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OptiPlex 990 Mini Tower (MT) Removal Guide for the Power Switch Cable, Front Thermal Sensor, System Fan, IO Panel and Power Supply | Dell US
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OptiPlex 990 Small Form Factor (SFF) Removal Guide for the Heatsink, Intrusion Switch, IO Panel, Internal Speaker and Power Supply | Dell US
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Amazon.com: Dell OptiPlex 990 Desktop Computer PC - Intel Quad Core i5 3.1-GHz, 16GB RAM, 1TB Hard Drive, DVD-RW Drive, USB WiFi Adapter, Windows 10 (Renewed) : Electronics
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