Dell OptiPlex NX1 User's Guide - Page 13
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Each time you turn on your computer system, the system compares the hardware installed in the system to the hardware listed in the system configuration information stored in nonvolatile random-access memory (NVRAM) on the system board. If the system detects a discrepancy, it generates error messages that identify the incorrect configuration settings. If an error message appears on the screen while the system is booting, make a note of the message. Then contact your network administrator. To turn off your system, press and release the power button. If the system does not turn off when you press the power button, the system may be hung. Press and hold the power button until the system turns off completely (this may take several seconds). An optional stand is available for your system that you can attach to the computer to give it a vertical orientation. Although you can attach (and remove) the stand at any time, it is easiest to attach before you set up your computer and connect any cables. Attach the stand as follows: Align the front edge of the stand with the groove between the front bezel and the computer cover. Move the stand until the locator pins fit into the holes in the side of the computer. Then align the captive thumbscrew in the stand with the screw hole in the cover. Introduction 1-3