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Taylor Shulman Aug 09, 2013, 01:57am EDT Report Abuse
So, I had just got a new power supply for my self built computer. (the computer is about two months old.) I got this new power supply so I could have enough power for two of my video cards. (both are XFX 7950s.) the PSU is a Toughpower Grand 850w by Thermaltake. My old power supply worked completely fine with what I had in my computer. When I plugged in both power supplies into the new one, however, it did not turn on my computer. The only power that I saw present was the little light showing next to the Ethernet port to show internet connection. When I hit the power button on my computer the power supply makes one click noise and nothing happens. No fans or anything. Just that little light. Everything is plugged in correctly. (I triple checked). And I did the paper clip test on my power supply. The fan did come on. I tried unplugging one of the video cards from the new power supply (to see if it would work in the same conditions as my old one) and it still made that one click noise and nothing turned on. This power supply is completely new and the parts in my computer are younger than three months old. I'm not sure if there is an internal problem. Any help is appreciated.

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john albrich Aug 10, 2013, 05:04am EDT Report Abuse
Search for similar threads in the HWA search bar (upper right corner) using keywords
[ system debug ].

In very general terms...the gist is to start with minimum configuration (e.g. mobo+CPU+PSU+1 RAMmodule) and work your way up if the PSU "click" failure does NOT appear with that minimum config.

If it did still fail, one starts on that minimum configuration by looking more closely for things your earlier (assumed) inspections might not have found:
mis-wired connectors (manufacturers DO make mistakes),
parts and connectors mis-installed (e.g. forced into place, or offset, or reversed, or etc),
obvious physical and electrical damage, etc.
Even try with the mobo and other components removed from the case (and placed on an appropriate ESD reducing environment) to eliminate metal case/stand-off shorts not visible with things installed.

Also trying to use other "known-good" computers to test suspect components and eliminate them as possible problems, etc. (there are risks there...also discussed in the debug threads). A process called "Easter-egging" may prove useful as well, but depends to which resources you have access.

The threads also discuss using a cheap go/no-go tester, voltmeters, and even oscilloscopes to determine if the PSU is the cause. These "quickie" tests can't PROVE the PSU is working 100% correctly under all conditions, but they can quickly show if there is a major PSU problem (e.g. steady-state over/under-voltage, bad power-good signal timing, etc).

And of course, always follow appropriate electrical personal safety and ensure system safety by following AC power removal, component power-sequencing and hot-plugging restrictions, and ESD handling protocols at all times...not just when it's convenient.



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