Having problems with your Dell OptiPlex GX520 PC Desktop ?

My computer smell like smoke and the power want come on? What to do?

Answers :

Your SMPS needs to be changed, its a small box ( switched mode power supply )

can be replaced by yourself. just open ur CPU .. find the place where it connects the Power chord, it should be going through a Small box SMPS .. remove it and take it to computer hardware shop , they would get you new one

Make sure you switch off your Power and unplug your power chords, its high voltage dangerous,,
Your power supply probably fried. If you aren't electronically knowledgeable, have a shop look at it.
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