PSU issue on one system only

PlumpMonkey · 25 Jul 2009 at 13:05

I recently purchase a new Seasonic 850W PSU to go with my new i7 overclocked bundle but Im having a hell of a time with the PSU.

The first PSU when connected, lights the motherboard lights, but on hitting the power button the system and PSU fans start to spin up and then immediately cut out. The motherboard lights stay on but the system fails to POST. Using an old 600W PSU I could boot the system happily so I RMAd the new 850W PSU.

On reception of the 2nd PSU, I installed it, and the system booted fine...twice.

Now I get the same symptoms as the first PSU where on hitting the power button the fans start to spin then cut out. Very occasionally it seems to boot for about 20 seconds then cuts out again.

Again the i7 works happily with the old 600W PSU. So i tried the new 850W in a couple of other systems. In both a Q6600 quad core system, and an old AMD X2 4600+ the new PSU works fine.

So in summary, the new PSU works fine in all systems except my i7 rig, and all other PSUs Ive tried with the i7 rig (A 600W and 700W) work ok. Its just this one PSU in this one system.

I put the i7 rig back to stock settings to rule out any overclock shenanigins before starting any of this.

Any ideas whats up with the PSU? Can I RMA it if its working ok in two other systems? Im baffled by this....

95thrifles · 25 Jul 2009 at 13:14

gremlins
seriously, the new EVGA mobo's are very PSU specific (I know this isnt yours), dont know why but it appears you have an incompatibility in the mobo/psu combination you've selected, you'll need a different one of either

siumatfung · 25 Jul 2009 at 14:49

get a corsair!

PlumpMonkey · 26 Jul 2009 at 09:15

I think I might have to! I was wanting something pretty efficient. The Corsairs dont seem to do so well at full loading, but are great at 50%

PSU Efficiency

capriboy1978 · 26 Jul 2009 at 11:45

i've bought the same psu. . . .presumably you have the gigabyte board? Chose the m12d 850w based on performance and build quality without having to spend the earth.

PlumpMonkey · 26 Jul 2009 at 11:53

Yes, I have the Gigabyte EX58-UD5 that came with the overclocked bundle, and it was the m12d 850W PSU that Im having trouble with. Like you I bought it for performance and supposed build quality. I find it rather strange that a supposedly reputable PSU like this fails to work with a motherboard in such a spectacular fashion but works ok in every other machine Ive tried it in

Do you have yours yet? Is it working ok if so?

capriboy1978 · 26 Jul 2009 at 12:18

still waiting on the rest of my rig. . .

Going with a foxconn blood rage, i was going to get the same as you but preferred the foxconn due to cooling and audio. Hope you get this sorted, try emailing gigabyte to see if psu is compatible- if it is then ur psu is duff.