Dell OptiPlex GX110 - Manual (Page 34)

If the power indicator blinks when you press the power button, but the system does not turn off, your operating system may have locked up. To turn
off the system in this situation, either press the power button a second time or press the reset button.
Reinstalling or Removing the AutoShutdown Service
If you need to reinstall the AutoShutdown service, see " System Utilities ." To remove the AutoShutdown service, perform the following steps:
1. Insert the utilities diskette into drive A.
2. Run the remove.exe utility from the diskette.
3. Make sure that AutoShutdown Service is selected, and click Next.
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NOTE: This scenario (a locked-up system with the AutoShutdown service active) is the only situation in which pressing the reset button
turns off the system without rebooting it.