Manny2003 Posted December 21, 2010 Share Posted December 21, 2010 I've just bought an AX850 PSU for my third PC. I'm already an happy owner of two HX650 installed in two other PC's. I also have a fourth PC, an old HP workstation XW4200. When I received the AX850 for my new config I installed it correctly and it worked for one day until I shut down my system normally and the day after, when I wanted to power on my computer, it stopped to switch on.The MB is a Gigabyte X58-UD7 that also have a power button on the mainboard. The standby power seems to be ok since I can see the internal power led and the external cmos button blue light on but when I try to power up my PC just two other phase DDR LED light up on the MB and nothing else happens.The problem is the PSU since I tried the same unit on one of the others PC with the same MB and I have the same result. I also tested the unit on the old HP Workstation that doesn't start up and just beeps 4 times (HP says 4 beeps are related to a power problem). How can this happens? The PSU shut the PC normally last time it was working and it seems very strange to me that a Gold series product could be faulty after only 24h. There is no smoke or smell. I'm proceding with a RMA, but I would like to understand if there is something I'm missing or that I can test to be sure the PSU is faulty. The paperclip test could be useless in my case since I already know that there is some power coming from the PSU because I can see leds on on the MB.Is there any security electronic system that could be active on the PSU? May be there is a way to "reset" the PSU. Sorry for fool reasoning but I'm trying to immagine everything. Every help is very appreciated! EDIT:I made the test with the paperclip and it works... I also tested all pins to check V and it seems ok for 3.3V 12V and 5V... Now I'm desperated... the PSU seems to work but no MB's are able to start with this! I also put the original MB on a paperboard out of the case to investigate for any shorts. Same problem. Could be this PSU incompatible with Gigabyte? I would say no since it has worked for a day and the HP Workstation show the same problem. So it's the MB faulty? No because the problem is the same on another PC that works well with a Corsair HX650! PLEASE give me a direction to follow... also the vendor says he will charge me if the PSU will result good after the RMA request. :( EDIT2:OK I'm going MAD!! After 2 days of testing I'm sure that the PSU does not work with any of the MB I've tested. After the paperclip test described in the EDIT before the PSU started to work again... I'm happy with this but I'm very afraid this could happen again so... Please help me to understand... Is there possible (I think you guys you should know Corsair PSU very well) that the PSU was blocked for some reason and that the fact that I made the paperclip test made it come back from dead making some sort of discharge/reset of the unit? Link to comment Share on other sites More sharing options...
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