phystromo Posted September 8, 2014 Share Posted September 8, 2014 Hi all, New account created to ask for some advice ! My old Corsair PSU blew up so purchased a new Corsair RM850 as I liked the idea of quiet running. Once received and cabled up however my PC would not power on. Zero activity, no lights on the motherboard or anything. Started reading up on the subject and performed the paperclip test to find the PSU span up ok and powered the fan I plugged in to test. I borrowed a spare PSU from a friend which powered my PC fine though doesn't have enough PCI-E connectors to power my graphics card but proved that my motherboard etc was at least intact. I have RMA’d the RM850 but the replacement is doing exactly the same thing. Is there such a thing as incompatibility with my motherboard? PC Specs should be in my profile but if you want any more information then let me know ! Thanks all. Link to comment Share on other sites More sharing options...
sandstorm1 Posted September 8, 2014 Share Posted September 8, 2014 try it on your friends computer if you could. sounds like something not hooked up properly. have you tried swapping where the 4+4 cpu header is plugged into? Link to comment Share on other sites More sharing options...
jameyscott Posted September 9, 2014 Share Posted September 9, 2014 That is weird. I doubt there is a compatibility issue since it is an ATX standard motherboard and ATX standard PSU. They are compliant with each other. There are some things you can troubleshoot though. Are all the connectors snug on both ends? Do you have the connectors going the right way? I.E cable ends going into the correct slot (PSU end going in PSU end, GPU in GPU end, etc etc) Please don't think that I am insulting your intelligence, just trying to cover all the bases! If it powers on with the paper clip test it's obvious the PSU isn't dead, and if your friend's PSU worked on your system (albeit with not enough connections) then there has to be some communication error between the PSU and the motherboard whether it be a cable not snug or just not plugged in. Link to comment Share on other sites More sharing options...
Corsair Employees jonnyguru Posted September 9, 2014 Corsair Employees Share Posted September 9, 2014 That is weird. I doubt there is a compatibility issue since it is an ATX standard motherboard and ATX standard PSU. They are compliant with each other. Doesn't mean too much. ATX spec for power good signal timing is a range. If the motherboard is looking for the signal outside of the range that the PSU is sending it, it could refuse to turn on. Link to comment Share on other sites More sharing options...
phystromo Posted September 14, 2014 Author Share Posted September 14, 2014 Thanks for the replies guys. I'm somewhat ashamed to admit that the actual issue was nothing to do with the power supply ! The original power supply blew up because of a faulty USB port on the front of the case which I had ruled out of my troubleshooting as I thought I had isolated it. The red herring that caught me out was my friends power supply starting the machine up but it turns out I wasn't really waiting long enough. It would cut out after 20 seconds or so whereas the new Corsair obviously has more protection built in. Fully isolating the USB (i.e. actually unplugging it from the motherboard rather than cutting the cables to it (I missed and cut the eSATA cable instead !)) has resolved the issue and I have my computer back up and running. Moral of the story, don't try and cut corners and actually unplug faulty things !! Link to comment Share on other sites More sharing options...
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