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Last Updated On May 08, 2018
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I have a Precision T3500 that just started not powering on. I went on vacation for about a week, powering down the system before leaving, where it was normally on 7/24 and working fine. Upon my return, when I tried to power the system back on, pushing the button had no effect. Upon opening the case, I noted that the amber led on the motherboard was lit and I saw the ethernet jack showing activity. Which is the most likely to be the culprit, the power supply or the motherboard? 
solution-LED on motherboard DOES NOT indicate that power supply is ok it only indicates that power is available from 5VSB.   Most common issue in this case is that the power supply has failed,  Unfortunately the only way to tell is to replace the power supply.You don’t have to use a Dell Power supply but for testing this is the recommended supply. Its a lot more complicated to remove all the cables and use a standard supply than it is to remove one cable from the dell unit and swap a new one in.
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