Dell OptiPlex 755 User's Guide - Page 243

Key Combinations or or in 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 start-up 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 a sleep mode; solid green indicates the 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.) Power supply status light green light - Solid green indicates the power adapter is connected to an AC outlet and the computer. amber light - Solid amber indicates the power adapter is connected to an AC outlet but not the computer. hard drive access light green 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 back panel (See "Diagnostic Lights" on page 347.) Standby power light AUX_PWR on the system board Ultra Small Form Factor Computer Specifications 243