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Dell Precision Tower 3420 Owner's Manual

Jumper settings

To change a jumper setting, pull the plug off its pin(s) and carefully fit it down onto the pin(s) indicated on the system board.
Table 1. Jumper settingsThe following table displays the system board jumper settings.
Jumper Setting Description
PSWD Default

Short: Default

Open: Clear Password

RTCRST Default

Open: Default

Short: Real-time clock reset. Can be used for troubleshooting


Open: Default

Short: ME disable

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