I am working on a Dell gx280 mini tower. I don't know the exact details of the 'power loss' but apparently the fan started making a noise like a 'hair dryer' and then the computer would not stay running. Eventually the computer would not start at all - another person tried putting a new motherboard in the unit and that appeared dead when it arrived - he couldn't get it going again so he returned it to the owner - that's when I got involved. I have had experience with around 150 of these models (in my job) and I found that the power supplies were lousy - probably had to replace about half of the power supplies because they 'died' in the manner described above so I got a new power supply and voila nothing happens - still no power but the aux power light on the motherboard. Any ideas of what to do next?
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The components which must be operable for a PC to power on are the PSU, motherboard, and CPU. It will usually power on with a faulty CPU unless electrical continuity through the CPU is lost. Barring a catastropic CPU failure, motherboard and PSU are left.
I recommend removing motherboard …
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