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VGA (D-Sub), HDMI, RJ-45 LAN, 6x USB 2.0 ports, and Audio (Mic-in, Line-out, Line-in). For detailed replacement steps, refer to the Dell OptiPlex 390 Owner's Manual provided by Dell Support :
: The first and most reliable source would be the official website of the motherboard's manufacturer. Look for a support or downloads section where manuals and drivers are typically available.
: While some sites might claim "cracked" versions, technical schematics are often shared by repair communities for troubleshooting "no power" or "not triggering" issues. Troubleshooting and Setup Tips MIH61R MB Motherboard
