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The power button operates in two modes: immediate and AutoShutdown mode.

When the system is off, the power button always acts in immediate mode—that is, when the button is pressed, the system starts up immediately.

When the system is on and the AutoShutdown service is installed, the power button operates in AutoShutdown mode. Pressing the power button signals the service to perform an orderly operating system shutdown (reducing the possibility of data loss and file corruption) before removing power from the system. During the shutdown sequence, the power indicator on the front panel of the computer flashes.

NOTE: The presence of the AutoShutdown service does not affect the operation of the system reset button.

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If, when you press the power button, the power indicator begins to flash but the sys- tem does not turn off, your operating system may have locked up. (A locked-up operating system cannot perform a safe shutdown.)

To ensure that the system can be turned off under these circumstances, a manual intervention mechanism has been included in the software. To turn off a locked-up system, either press the power button a second time or press the reset button.

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The Dell ThermalShutdown service helps protect components such as the system processor and the primary hard-disk drive from damage due to overheating. It can also protect your system data from loss or corruption resulting from a thermal-related system shutdown.

When installed, the service uses sensors to monitor the temperature of critical inter- nal components. If a sensor detects a thermal event, the system first performs an orderly operating system shutdown and then turns itself off. During the shutdown phase, the power indicator flashes and a screen message notifies the user that the system is shutting down.

If the ThermalShutdown service is unable to shut down the system, the system will be shut down if Thermal Power-off is enabled in the System Setup program. (See “Thermal Power-Off” in Chapter 3 for more information.)

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