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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.
DELL-Shawn B
3 Apprentice
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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,