i found this dell optiplex 755 in a scrap yard perfectly functioning{came with side panel just have it off} its ungodly slow with only a single stick of ddr2 2gb ram and
Dell Optiplex 755 USFF Celeron (430) No Optical Windows 10
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Optiplex 755 | Dell Optiplex 755 Core 2 Duo 2.33Ghz Desktop PC | USED | Computers · PC User