@ruthrea could be lots of things and you have to tell us what you have already tried. I would start off by checking the power supply. After that, check the power switch to make sure that works. Your OptiPlex use diagnostic LED's, and Beep codes for any hardware issues. If you get none of those, it is most likely a power issue. Check your power supply first. Looks like your Dell OptiPlex may also have a self-test diagnostic for the power supply. Check for that [https://www.dell.com/support/kbdoc/en-us/000125179/how-to-run-a-power-supply-unit-self-test-on-a-dell-desktop-or-all-in-one-computer|on here]
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@ruthrea could be lots of things and you have to tell us what you have already tried. I would start off by checking the power supply. After that, check the power switch to make sure that works. Your OptiPlex use diagnostic LED's, and Beep codes for any hardware issues. If you get none of those, it is most likely a power issue. Even if the green LED on the back of the power supply is on but if the PSU fan does not spin correctly, consider the power supply as failed. Check your power supply first. Looks like your Dell OptiPlex may also have a self-test diagnostic for the power supply. Check for that [link|https://www.dell.com/support/kbdoc/en-us/000125179/how-to-run-a-power-supply-unit-self-test-on-a-dell-desktop-or-all-in-one-computer|on here]
Use the [document|38877] to work on your computer and page 47 show you all the troubleshooting.
@ruthrea could be lots of things and you have to tell us what you have already tried. I would start off by checking the power supply. After that, check the power switch to make sure that works. Your OptiPlex use diagnostic LED's, and Beep codes for any hardware issues. If you get none of those, it is most likely a power issue. Check your power supply first. Looks like your Dell OptiPlex may also have a self-test diagnostic for the power supply. Check for that [https://www.dell.com/support/kbdoc/en-us/000125179/how-to-run-a-power-supply-unit-self-test-on-a-dell-desktop-or-all-in-one-computer|on here]
Use the [document|38877] to work on your computer and page 47 show you all the troubleshooting.