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March 17th, 2014 02:00

Dell Optiplex 790 (SFF) - Diagnostic Light #3 after switch on.

Hello!
After turning on the computer diagnostic winking lights and stops at 3 and power button shines blue. The boot stops. Does anyone have any ideas?
Thank you.

3 Apprentice

 • 

540 Posts

March 17th, 2014 06:00

Hello Nick,

Sorry to hear your OptiPlex is not powering up any longer. A number ‘3’ LED light alongside a solid blue power button usually indicates a problem with the motherboards ability to communicate correctly with the systems memory or processor. I recommend reseating the memory initially and testing sticks individually to see if a single slot/stick has failed.

If this does not resolve the issue try unplugging any peripheral devices and resetting / swapping a known good processor to test its connection.

For further troubleshooting check out our guide here:

http://www.dell.com/support/troubleshooting/us/en/19/KCS/KcsArticles/ArticleView?c=us&l=en&s=dhs&docid=266435_zh

 

Dell OptiPlex 790 Small Form Factor - Service Manual

ftp://ftp.dell.com/Manuals/all-products/esuprt_desktop/esuprt_optiplex_desktop/optiplex-790_owner%27s%20manual3_en-us.pdf

 

Let us know how it goes,

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