Adapter and battery should be connected as the installation and download will take a long time depending on the internet speed. Ideally connect the Ethernet cable to avoid any disconnects during the download.
These guides will take you step by step through the safe removal of what are considered to be the Customer Replaceable Unit (CRU) parts of the Various OptiPlex 580 systems. (CRUs are the parts of the system that shouldn't need an engineer to remove or replace.
Issue: Poor network performance, reduced network throughput, NIC collisions and client disconnects occur due to improperly configured network switch settings when using an Intel or Broadcom 802.3ad LACP network team.
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