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Thread: Corsair 750i - possibly fried?

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    Default Corsair 750i - possibly fried?

    Hello,

    So, I've been having a lot of PC related troubles recently. I'm a complete novice to building PC's, and after my old power supply had died I tried replacing it with a brand new corsair 750i pcu. That did not go terribly well. I confused an 8 pin gpu power cable with the eps/atx12v cable, and as a result I have fried both my CPU and the motherboard. I figured this would be a good opportunity to upgrade (always look on the bright side of life?), so I replaced the broken parts with x570 motherboard and amd ryzen 3900x. I am using the same power supply as in the previous attempt. This time I made double sure I have connected absolutely everything just the right way, 100% according to the manual (and also with help of some youtube videos). However, the end result is somewhat disturbing. When I plug the computer to power and flip the switch, the light on the motherboard lights up white for a fraction of a second, then dies. The computer does not turn on. I can get it to happen again if I unplug the computer and wait for a few seconds before plugging it in again.

    The reason why this is disturbing to me, is that this is a very similar symptom to what I had after I fried my old mobo - except that one didn't have any lights, so it were the fans that were spinning for a fraction of a second instead. (The fans on the new mobo don't move at all during this, btw.) I have made sure that I did not commit the same mistake as the last time, but the thought of frying a brand new CPU that costed half of my savings does send shivers down my spine.

    Since I used the same power supply in both attempts, is it possible that the PCU got damaged during my initial mistake, and that is why my computer doesn't work now? I would try running my computer with some different one and see if it works, but I don't have any spare parts, and to be honest after all these adventures I am a little short on cash for now. I just hope the CPU is alright...

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    Quote Originally Posted by WhyNott View Post
    When I plug the computer to power and flip the switch, the light on the motherboard lights up white for a fraction of a second, then dies.
    You still have something plugged in wrong. Either wrong cable for the PSU (from another brand) or the wrong connector plugged into something.

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    Someone needs to standardize modular cables.

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    Quote Originally Posted by ashiekh View Post
    Someone needs to standardize modular cables.
    It's kinda already are ... They're keyed differently :

    EPS : Attachment 3978
    PCI-e : Attachment 3979

    And at least in the case of RMx i have, you can't even plug these cables the other way around, no idea how OP pulled that off ...

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    I meant the cables from one supply used on another.

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    Hi, sorry for the late reply,


    I have unplugged everything now except for the 4+4 cpu connector and the 24pin atx one, and its still the same. I am pretty sure they are attached correctly - I double-checked from every front.

    I dont think I used any of the cables from the old power supply - I was informed before not to do that, and in any case some of them (like the 24pin one) were permanently attached to the old PCU on one end. I compared with the manual, and I don't have any surplus cables compared to what has shipped with the new PCU.

    I did notice something interesting I didn't before - when the computer is turned on and I press the power button, the fans flash with rgb lights and start spinning for a split second. I don't know if I should take it as a good or a bad omen. On one hand it means something is working, but on the other its simillar to my experience with the previous mobo.

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    Quote Originally Posted by WhyNott View Post
    I did notice something interesting I didn't before - when the computer is turned on and I press the power button, the fans flash with rgb lights and start spinning for a split second. I don't know if I should take it as a good or a bad omen. On one hand it means something is working, but on the other its simillar to my experience with the previous mobo.

    I have a bust power supply that does just that, the fan glitches for a split second.

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