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How do you fix a dell dimension 8400 that won't turn on?

Updated: 10/3/2023

Wiki User

∙ 15y ago

Best Answer

My Dell 8400's CPU would not stay powered on. I'd be able to turn it on, begin the start-up stages, but then it would suddenly die. After a few days of trying to diagnose the problem via the web on my wife's work laptop, I found the most likely culprit to be the power source inside the machine. I took the leap of faith and ordered a new power unit at PCPowerZone.com and opened the 8400 for the first time when it arrived. 20 mins. of tinkering and moving wires this way and that, I had the new power source in. Closed everything up, and....success!

Wiki User

∙ 15y ago

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Wiki User

∙ 13y ago

The Power supply can be bad.

Install a new one.

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