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How can I test FSP250-60 ATV power supply to see if it works or not? Can I test it before I buy a replacement unit? Computer will not power up. Alredy switched power cords several times...and it still won't power on.

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A great way to test a PSU is to use a PSU Tester. The device allows you to see if all the circuits are getting power and it only requires you to plug it in to power. This allows the ability to test it safe and reliably without accidentally damaging hardware. Below is a link to a tester.

PSU Tester

Posted on Feb 03, 2009

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Disconnect PSU from MOBO and then short GREEN to ANY BLACK pins....if the PSU fan turns it's OK if not use a voltmeter to check for DC voltage....+12, -12, +3.3, etc....if present, PSU is OK but PSU fan is dead...

Posted on May 20, 2009

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Posted on Jan 02, 2017

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This doesnt' look like the motherboard right away. First I would try the unit with another power supply. Using a power supply tester may let you know that the unit can give power or turn on but does nto mean the PSU is able to work with a load.

Many time dell will still have the lights even though the PSU is bad. On the back of the unit when you hit the power button. There should be status messages etc that can tell you if the unit detects issues.

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