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Corsair tx650 v2 on HP H8-1234 not working

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October 3, 2012 9:19:16 PM

I upgraded my PSU on my HP H8-1234 with a Corsair TX650 V2. When I press the power button, the fans turn On for a second then everything shuts down. This happens as I fully press the Power button down then again as I let go of the button. Bottom line is that my desktop does not Power On when using the Corsait TX650. This is the third unit of the same model that I have tried and all did the same thing. I then used a Thermaltake 600 PSU and it worked just fine. I don't think its the TX650 that has a problem but it seems that there is an incompatibility between my H8-1234 and the TX650. Any advise? I really prefer to use the TX650 over the Thermaltake.
a b ) Power supply
October 3, 2012 10:51:45 PM

The easiest conclusion I come to is that the 3x Corsair PSUs were all bad.

Usually that model line isn't bad, but I have seen a PSU die just from being unplugged from the motherboard before.
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December 18, 2012 11:12:31 PM

I am having a similar problem. I have the same HP computer and when trying to upgrade my PSU it is doing the same thing as the OP's problem. Flickers for a half second and off. I have tried both the Thermaltake Smart Series 750W and 850W. Both do the same thing. Any answers?
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December 19, 2012 1:47:41 AM

Apparently I ended up returning the Corsair PSU and settled for a Thermaltake TR2 600W PSU which worked just fine without any problems. It seems that the Power switch of the HP H8-1234 has a compatibility issue with PSU Power switch.
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a b ) Power supply
December 19, 2012 4:42:24 AM

I have seen this before. Perfectly good PSU's and motherboards that just dont like each other. Not sure why it happens, but it seams to from time to time.
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December 19, 2012 5:55:38 PM

Best Buy geek squad figured out what the problem was for my particular unit. All of the thermaltake's were outputting 12.1 V when the motherboard was requiring 12.2 V. That small difference created all the chaos.
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