Dell Precision 390 User Manual

Also see for OptiPlex 390: Setup & features Quick reference guide Specifications Specifications Setup & features

Contents

11. Replace the computer cover. See Replacing the Computer Cover.12. Connect your computer and devices to electrical outlets, and turn them on.BatteryAbout the BatteryA coin-cell battery maintains computer configuration, date, and time information. The battery can last several years.The battery may need replacing if you have repeatedly reset the time and date information after turning on the computer or if one of the following messagesappear:Time-of-day not set - please run SETUP programorInvalid configuration information -please run SETUP programorStrike the F1 key to continue,F2 to run the setup utilityTo determine whether you need to replace the battery, re-enter the time and date in system setup and exit the program to save the information. Turn off yourcomputer and disconnect it from the electrical outlet for a few hours; then reconnect the computer, turn it on, and enter system setup (see Entering SystemSetup). If the date and time are not correct in system setup, replace the battery.You can operate your computer without a battery; however, without a battery, the configuration information is erased if the computer is turned off orunplugged from the electrical outlet. In this case, you must enter system setup (see Entering System Setup) and reset the configuration options.Removing the Battery1. If you have not already done so, make a copy of your configuration information found in system setup (see System Setup).1. Follow the procedures in Before You Begin.1 heat-sink assembly 2 heat-sink assembly bracket 3 captive screw housing (2)NOTICE: To connect a network cable, first plug the cable into the network port or device and then plug the cable into the computer.CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.CAUTION: A new battery can explode if it is incorrectly installed. Replace the battery only with the same or equivalent type recommended by themanufacturer. Discard used batteries according to the manufacturer's instructions.NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of yourcomputer's electronic components. You can do so by touching an unpainted metal surface on the computer.