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Originally Posted by Beest
So is that definitive on the PSU ?
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Yeph. That type of failure is typically a manufacturing defect. The defect may have existed many months ago. It was not a switch. A coin cell battery. Heat. A surge. Mishandling. The wife. Mystery currents from the plug. Failed motherboard. Defective BIOS. Bad CPU. Undersized video card. Intermittently getting loose wire. Dust. Undersized supply. Defective disk drive. Stuck fan. Or many suspects blamed on wild speculation to justify replacing parts. Another part of the supply that more often fails did not fail in yours. You had a failure of a tiny supply that should rarely fail. Sometimes, that entire 5VSB supply is only a single integrated circuit. A part that typically costs about $0.90.
Now, replace the supply. Ignore all discussion about watts as taught by advertising, hearsay, and A+ Certified computer techs. That supply should list an amp numbers for each voltage. A replacement supply must meet or exceed each DC amp number.
Of course, a new supply must have similar connectors, screw holes, and dimensions. Those dimensions are usually industry standard. Most important are ampere numbers for each DC voltage. Simply meet or exceed the number for each DC voltage.
A supply costing less than $60 is typically missing essential functions. That does not say a greater than $60 supply is better. That only says anyone selling a supply for $40 should be selling it for near zero profit. Or the supply must be missing essential functions.
When installed, one simple test will confirm the new supply is not defective. A defective supply can still boot a computer. But about one minute of labor quickly identifies some defects before its warranty expires.