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Restored Dell Optiplex 780-SFF WA1-0304 Desktop PC with Intel Core 2 Duo Processor, 4GB Memory, 1TB Hard Drive and Windows 10 Pro (Monitor Not Included) (Refurbished) - Walmart.com
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Refurbished: Dell OptiPlex 780 USFF Desktop Intel Core 2 Duo E8400 3.0GHz 4GB DDR3 RAM 250 GB HD DVD-RW WiFi Bluetooth Microsoft Windows 10 Pro - Newegg.com
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Amazon.com: Dell Optiplex 780 Desktop Business Computer PC (Intel Dual-Core 2.93GHz Processor, 4GB DDR3 Memory, 250GB HDD, DVD, Windows 10) - (Renewed) : Electronics
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OptiPlex 780 Ultra Small Form Factor(USFF) Removal Guide for the System Cover, Front Bezel, Drive Cage, Hard Drive and Optical Drive | Dell US
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