What psu would power this system .

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What's the full spec of the system in question?

CPU, RAM, Mobo, 3HDD, 1DVD and a GTX 550 should not need a 750W PSU. How old/what was the 750W PSU?
 
Soldato
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Asus rampage 3 extreme. 6 gig corsair 3 hard drives 1 of which is a ssd a DVD rom he bought a refurb 1000 watt sea sonic stupid I no GeForce 550 that's it as I've said it was my old build .
 
Soldato
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About 2 years old I think I tested it again just to rule out the refurbished psu he bought and it worked ok so his refurb psu is crap lol. Cos it wouldn't power on lights on try mobo came on but when you tried to power it on. It wouldn't work.
 
Soldato
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depending what your processor is, you probably wouldnt need more than 500w, the 550 is not that powerful.

hell my sig is what my computer is and the 270x much better than the 550 and my 520w psu has no problems.
 
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Major overkill. It's all about quality with PSUs - a smaller wattage better built power supply is better than a cheap one with a higher wattage.
 
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