Odaik Posted October 31, 2009 Share Posted October 31, 2009 hello, I recently built a new system with a corsair HX850 modular PSU, and an Asus rampage ii extreme motherboard. I'm also using the i7 920 D0 CPU. The problem I have is, whenever I try to switch on the system, it powers on for 1 second, then switches off. I can rectify the situation by removing the 8 pin PSU cable that plugs in near the CPU socket, but then the system won't boot obviously. I've done all the usual diagnostic and bare bone tests etc. I've been told it is due to an over current situation created by the PSU. I've tested the connector, and I get 12.13V; I have tried all combinations between the 4 yellow 12V wires and the 4 grounds, and have tried shutting down and restarting the PSU. Always the same result. Is this out of spec? Could it cause my issues? Bizzarely however, when I test the molex connectors, I get 12.08V. How is this? They all run off the same rail as the 8 pin, right? Unless the modular system introduces a significant source of resistance. Odai. Link to comment Share on other sites More sharing options...
Wired Posted October 31, 2009 Share Posted October 31, 2009 It's well within spec, which is +-5%. That means it has to be within 11.4v to 12.6v. Link to comment Share on other sites More sharing options...
Odaik Posted October 31, 2009 Author Share Posted October 31, 2009 So even if it is what is causing the issues, I still can't claim it is faulty? What about the discrepancy between the 8 pin and molex? Link to comment Share on other sites More sharing options...
PCCstudent Posted November 1, 2009 Share Posted November 1, 2009 I would say it is due to an over current situation DETECTED by the P/S but not created by the P/S. Wired has responded and did not suggest RMA so I don't know what to tell you but to place your request again. Link to comment Share on other sites More sharing options...
Wired Posted November 1, 2009 Share Posted November 1, 2009 I have nothing to do with Corsair's RMA process. Link to comment Share on other sites More sharing options...
Odaik Posted November 1, 2009 Author Share Posted November 1, 2009 Thanks for your replies. What about the difference in voltage between the molex connectors and the 8 pin connector? Link to comment Share on other sites More sharing options...
Odaik Posted November 4, 2009 Author Share Posted November 4, 2009 *bump* :o: Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted November 4, 2009 Corsair Employees Share Posted November 4, 2009 Thanks for your replies. What about the difference in voltage between the molex connectors and the 8 pin connector? I wouldn't call 5 hundredths of a volt a significant amount of fluctuation, but its certainly possible that the modular cables may measure slightly differently than the fixed ones. I would not suspect that the variance of the voltages would be the cause of your problem. In this case I would try testing the PSU in a different system and see if you can duplicate the same issues. If all else fails we can certainly try replacing the unit for you, just use the On Line RMA Request Form and we will be happy to replace it. Be sure to check the box that says “I've already spoken to Technical Support and/or RAM Guy.” Link to comment Share on other sites More sharing options...
Odaik Posted November 4, 2009 Author Share Posted November 4, 2009 hello, Thanks. I'll be getting a new motherboard back tommorow, I'll do a barebones test as soon as possible. If this proves faulty too, I'll RMA the PSU. Link to comment Share on other sites More sharing options...
Armind Posted November 9, 2009 Share Posted November 9, 2009 hello, Thanks. I'll be getting a new motherboard back tommorow, I'll do a barebones test as soon as possible. If this proves faulty too, I'll RMA the PSU. Hi Odaik. Im new here and was serching for this spec topic. I have the exact same problem with my system(see sign). It only boots for 1 second and shuts down. But if i let the system be plugged for a while about 2-3 hours the system boots fine. So what did you do? RMA the motherboard or PSU? Thanks Link to comment Share on other sites More sharing options...
Odaik Posted November 10, 2009 Author Share Posted November 10, 2009 hello :) I ended up RMA'ing the motherboard, and I got back a new revision board (2.01G) which has been fantastic so far. No problems at all. Link to comment Share on other sites More sharing options...
Armind Posted November 16, 2009 Share Posted November 16, 2009 Thanks man! I was almoste going nuts over this issue. I first had a HX1000W and it didnt work. So i replaced it with a TX850W and neither did this PSU work with my motherboard. So i will send in my motherboard now. Seems to be a problem around the 12v thing for the CPU. Anyway thanks alot! Link to comment Share on other sites More sharing options...
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