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CMPSU-750TX: Worked one evening and now mobo error for "check cpu core voltage"


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I bought a new PC yesterday, installed everything fine and dandy and went into the world of windows. I played and customized windows a bit and turned off the PC when i went to bed.


I came home from work today and tried to turn on the PC, only to notice that none of my screens (dual view) would light up. Annoyed, i opened the PC case and looked at the motherboard CMOS Code. It kept standing on 83 ("ATX power supply ready"). Now a split second after every cycle (the cycle of restart is about 5-10 seconds), it jumps to 87, and then back to 83 again. I looked up what 87 means and it says: "Check CPU Core voltage".


I tried to replug everything, i cleared CMOS, and tried this a number of times to no avail. I then used my old Enermax Coolergiant PSU with a 20->24pin converter, and a 4pin 12v cable. The motherboard powered up fine and im writing on the PC right now.


The curious thing is indeed this: It worked perfectly fine for multiple PC restarts and turnoffs one evening. Now it won't boot up the system.


I tried to hotwire the Corsair on ATX, and run the Enermax 12v, and vice versa. But none of them wanted to boot (prolly because the 12v and atx has to be started at the same time? I don't know).


Edit: The Corsair PSU is actually hotwired now and powering all my harddisks in the system, including the videocard. The Enermax however, is still powering the ATX and the 12v.


Point remains: Is my PSU broken? Or is there something im really missing? Like i said, i just turned it off yesterday, and now it wont boot.




Fabian Dik


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As far as I know if you use dual-PSU you should connect the two units between them with I think the green cable (not sure), so they both start simultaniously when you press the power button.


Also beware! Don't let the power chains from both PSU-s contact with each other in any unit of your computer! For example have one PSU power the videocard via its power connector, and the other one via the PCI-E slot, which you have right now! This is known to burn components. Did I make myself clear enough on this?

For example from one PSU you can power the HDD's and ODD's because they don't drain power from other places, but the for example the graphics card draws power both from the slot and power connectors, and these should be powered from one PSU. I'm not sure whether the processor draws power from several places as well.


I know my post is not quite on topic, but I just read yesterday about such burned videocard.

Also it would be good if the PSU's are of the same wattage, otherwise the less powerfull PSU may burn out from getting more load than it's expected to. Can't explain this though.

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