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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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OptiPlex 990 Small Form Factor (SFF) Removal Guide for the System Cover, Front Bezel, Optical Drive, Drive Cage and Hard Drive | 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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OptiPlex 990 Ultra Small Form Factor (USFF) Removal Guide for the Wireless Module, Internal Antenna, System Fan, Memory and Heatsink | Dell US
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