My pc is only showing yellow light with no display and chek the hard drive and ram both are working also chek the supply it is fine. But only show yellow light not showing anything. Kindly tell me if you know about
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Check the diagnostic lights on the back of the case and see what pattern is shown when the Power light is Amber.
Go to p.14 of 74 in the owner manual to see what each pattern means.
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@raheelirshad just to verify, your computer is a Dell OptiPlex 780 Small Form Factor. What light is the yellow light that is showing? Are you referring to the power light? How did you determine all of this "chek the hard drive and ram both are working also chek the supply it is fine"? How did you check that?
by oldturkey03