Dell OptiPlex 390 Support Question
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Question posted by jorjon on December 29th, 2013
Dell Error Code 3 4 Optiplex 390 Won't Power On
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Current Answers
Answer #1: Posted by Anonymous-130750 on February 11th, 2014 6:50 PM
The boot up problem as well as random shutdown can be easily fixed. I had the same problem and replaced EVERYTHING with no luck.
Turns out (and this is gonna sound stupid) the power button is bad. Just replace it and all your problems will go away.
You can find them on ebay for 10 to 15 bucks.