8 speaker, 9 heat sink and processor, 10 processor – Dell OptiPlex 790 (Early 2011) User Manual
Page 4: 11 coin-cell battery, 12 system fan, 13 input/output panel, 14 power supply, 15 system board

Installing The Chassis Intrusion Switch
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Installing The Internal Speaker
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9 Heat Sink And Processor........................................................................25
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Removing the Coin-Cell Battery
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Installing The Coin-Cell Battery
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Removing the Input/Output Board
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Installing the Input/Output Board
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