Dell OptiPlex 755 User's Guide - Page 178

Key Combinations or or If you are running Microsoft® Windows® XP, brings up the Windows Security window; in MS-DOS® mode, restarts (reboots) the computer starts embedded system setup (during system start-up only) automatically starts the computer from the network environment specified by the remote boot environment (PXE) rather than from one of the devices in the system setup Boot Sequence option (during system startup only) displays a boot device menu that allows the user to enter a device for a single boot (during system start-up only) as well as options to run hard drive and system diagnostics displays the Management Engine BIOS Extension settings screen that allows you to modify the settings Controls and Lights Power control push button Power light green light - blinking green indicates sleep mode; solid green indicates power-on state. amber light - blinking amber indicates a problem with an installed device; solid amber indicates an internal power problem (See "Power Problems" on page 339.) hard drive access light green Link light solid green light indicates network connection Link integrity light (on integrated network adapter) green light for 10-Mb operation; orange light for 100-Mb operation; yellow light for a 1000-Mb (1-Gb) operation Activity light (on integrated network yellow blinking light adapter) Diagnostic lights four lights on the front panel (See "Dell Diagnostics" on page 353.) Standby power light AUX_PWR on the system board Power DC power supply: Wattage NOTE: Power consumption from an AC power source can be zero when the computer is unplugged from that power source. However, the computer draws minimal power from the internal coin cell battery even when the computer is not drawing power from the AC power source. 275 W 178 Small Form Factor Computer Specifications