Dell OptiPlex 330 Quick Reference - Page 30
Back View, CAUTION - pci express
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Back View 1 2 3 4 5 6 1 card slots Access connectors for any installed PCI and PCI Express cards. 2 back panel connectors Plug USB, audio, and other devices into the appropriate connector (see "Back Panel Connectors" on page 31 for more information). 3 power connector Insert the power cable. 4 voltage selector switch For selecting voltage rating. 5 padlock rings Padlock rings are for attaching a commercially available antitheft device. The padlock rings allows you to secure the computer cover to the chassis with a padlock to prevent unauthorized access to the inside of the computer. To use the padlock rings, insert a commercially available padlock through the rings, and then lock the padlock. 6 cover release latch Use this latch to open the computer cover. CAUTION: Ensure that none of the system air vents are blocked. Blocking them would cause serious thermal problems. 30 Quick Reference Guide