After working inside your computer, Important information – Dell OptiPlex 9020 All In One (Mid 2013) User Manual

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After Working Inside Your Computer

After you complete any replacement procedure, ensure you connect any external devices, cards, and cables before
turning on your computer.

Replace the cover.

CAUTION: To connect a network cable, first plug the cable into the network device and then plug it into the
computer.

Connect any telephone or network cables to your computer.

Connect your computer and all attached devices to their electrical outlets.

Turn on your computer.

If required, verify that the computer works correctly by running the Dell Diagnostics.

Important Information

NOTE: Avoid using the touchscreen in dusty, hot, or humid environments.

NOTE: Sudden change in temperature may cause condensation on the inner surface of the glass screen, which will
disappear after a short time and does not affect normal usage.