Dell OptiPlex 740 Quick Reference Guide - Page 32

9 serial connector Connect a serial device, such as a handheld device, to the serial port. The default designations are COM1 for serial connector 1 and COM2 for serial connector 2. NOTE: There is only a serial connector 2 if the optional PS2/serial adapter is used. For more information, see "System Setup Program" in your online User's Guide for instructions. Removing the Computer Cover 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 removing the cover. Before You Begin NOTICE: To avoid losing data, save and close any open files and exit any open programs before you turn off your computer. 1 Shut down the operating system: a Save and close any open files, exit any open programs, click the Start button, and then click Shut Down. b In the Shut Down window, select the Shut Down option from the drop-menu, and then click OK. The computer turns off after the operating system shutdown process finishes. 2 Ensure that the computer and any attached devices are turned off. If your computer and attached devices did not automatically turn off when you shut down your operating system, turn them off now. Before Working Inside Your Computer Use the following safety guidelines to help protect your computer from potential damage and to help ensure your own personal safety. CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. 32 Quick Reference Guide