coma200s Posted November 22, 2013 Share Posted November 22, 2013 Hello to everyone. I have encountered an issue with a Corsair AX1200 PSU powering intel DX58SO motherboards in the company I work for. I will not get into more details if needed, but I really am fighting to figure out this problem for more than a week now to no avail. To simple down things: Corsair PSU + DX58SO (tried 3 different revisions of the motherboard, 404, 504, 703) plus different bios updates up to the latest. Motherboard setup: CPU Intel Core i7 Extreme 980X (Gulftown 32nm) RAM Kingston KHX1600C9D3K3 (12GB kit of 3x4GB) VGA Palit NVidia GeForce GTX 550 Ti HDD Typically 6x WD Velociraptor 1TB WD1000DHTZ (3x Raid1 arrays setup) I know the first thing to do in order to figure out a problem is try to recreate it. So in my case, I stripped out all the HDDs, even tried moving around (adding or subtracting) the ram modules but the problem remains, and it is the following: In case of a power failure, the machine does not really seem to be able to recover to its previous (powered on) state. Scenario 1: Simulated power failure for <5sec. After power resume, the machine boots up normally. (the green mobo led next to the 24pin remains on during this scenario) Scenario 2: Simulated power failure until the green mobo led turns off, which means the mobo is not getting any power. After power resume, the machine boots up normally. Scenario 3: Simulated power failure for >5sec but BEFORE the green mobo led turns off. After power resume, the machine fails to boot. Pressing the case power button does nothing. (although the green mobo led remains ON) At scenario 3, it seems there is a time period between the power failure and the complete loss of power to the motherboard - after about 10sec - when the PSU will once do a "clicking" sound and then start an indistinct "hissing" sound, that I needed to stick my ear on the PSU to hear it. And now the machine is in a "stuck" state. Seemingly getting power but not really doing anything. No fans, no nothing, just the led of the motherboard and the led of the PSU on, and the "hissing" sound as well. Case power button press does nothing. To work around the issue and have a successful boot, I either need to drain the power completely (make the green motherboard led go OFF) or, interestingly, to just hold the case power button for around 5sec (when at that time the PSU's indistinct "hissing" stops and an ever more silent continuous sound comes off the PSU) release the button and then press it normally. The green mobo led remains ON during that time, but by the difference in the sounds of the PSU I can understand when it gets "unstuck" and is ready to power on normally again. I have read about the "latch-off" issue and incompatibilities with hashwell cpus, but I do not have a hashwell and even if I did, the AX1200 is officially posted as fully compatible. So what is wrong? -Remember I have tried two AX1200 PSUs with several DX58SO mobos of different revisions and the result is the same. Needless to say that other PSUs do not cause this "stuck" state. Forgive my long post, but I'm trying to be as clear as possible with this subject. I am running out of options and believe the only cause is a spec incompatibility or something. Of course I will be happy to provide you with more info that I may have omitted but really I think I have reached a wall in my self-research. This issue is not only a testing scenario, but a real thing, because in my region the power fluctuations sometimes do cause short-term power failures. If a power failure is between this "critical" time period of ~10sec, the machine will not switch back on, even if the motherboard is set to "After power failure= power on". (and yes, we have UPS device but this has nothing to do with the problem I'm dealing with atm) Thanks in advance, Spyros Link to comment Share on other sites More sharing options...
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