Dell OptiPlex DHS Series Setup And Quick Reference Manual

12 Setup and Quick Reference Guidew w w . d e l l . c o m | s u p p o r t . d e l l . c o m• To help protect your computer from sudden, transient increases and decreases inelectrical power, use a surge suppressor, line conditioner, or uninterruptible powersupply (UPS).• Ensure that nothing rests on your computer’s cables and that the cables are not locatedwhere they can be stepped on or tripped over.• Do not push any objects into the openings of your computer. Doing so can cause fire orelectric shock by shorting out interior components.• Keep your computer away from radiators and heat sources. Also, do not block coolingvents. Avoid placing loose papers underneath your computer; do not place your computerin a closed-in wall unit or on a bed, sofa, or rug.• Do not spill food or liquids on your computer. If the computer gets wet, consult yourUser’s Guide.CAUTION: Safety Instructions (continued)When Using Your ComputerAs you use your computer, observe the following safe-handling guidelines.CAUTION: Do not operate your computer with any cover(s) (including computercovers, bezels, filler brackets, front-panel inserts, and so on) removed.• Your computer is equipped with one of the following:– A fixed-voltage power supply — Computers with a fixed-voltage power supply do nothave a voltage selection switch on the back panel and operate at only one voltage(see the regulatory label on the outside of the computer for its operating voltage).– An auto-sensing voltage circuit — Computers with an auto-sensing voltage circuit donot have a voltage selection switch on the back panel and automatically detect thecorrect operating voltage.– A manual voltage selection switch — Computers with a voltage selection switch onthe back panel must be manually set to operate at the correct operating voltage.