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tomash
Asked: 2009-07-01 02:27:53 +0800 CST

What is the button on power supply of the Dell Optiplex 760 workstation for?

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What is the button on power supply of the Dell Optiplex 760 workstation for? There is a small button near LED power indicatior - seems to do nothing when pressed.

power-supply-unit dell

4 Answers

  1. Best Answer

    It has a green LED above it and is used to test the PSU without opening the case and testing the PSU.

    I have one here in my office and I believe thats what it does.

    Note that when plugged in and pressed, it fires up the PSU for just a second.

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  2. It's called the Built-In Self-Test (BIST) for the power supply. The BIST can be used to isolate and troubleshoot power failures throughout the system.

    Here is a video from Dell about it: https://www.youtube.com/watch?v=udGOe7LQJEI

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  3. Possibly the PSU has a circuit breaker built in as additional protection against electrocution / other electrical fun. The button would then be a reset for this circuit breaker.

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  4. Is it set to 'soft off' or disabled in the BIOS. Most power buttons nowadays can be changed to set to standby instead of hard power down.

    Try pressing it in for 4 seconds, that forces a full power off on all power buttons.

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