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HX1000i not powering on PC


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I built my PC just over a year ago with all new parts and it has been working perfectly until last week. Now when I press the power button on the case or motherboard nothing happens. There is some power getting through as the MB LED ambient lighting is on. The only way I can get the PC to boot is to switch the PSU off at the back and unplug the power cable for at least 5 minutes then it will start normally. Even if I switch the PSU off using its switch but leave the power cable connected to the PSU, it won't start, I have to physically remove the cable from the PSU which seems really strange to me. Once the PC boots up it runs perfectly until I shut it down again then have to switch the PSU off and pull the power cable out. I've already been advised to try a different PSU but no-one I know has a PSU lying around and a new one costs £229 so I don't want to risk it in case it's not the PSU after all and it's the MB or something else. I've checked for any earthing problems but everything seems ok, tried a different power lead and electric socket but no joy. Has anyone had a similar experience and is it likely to be the PSU which isn't very old at all and bought because of good reviews. The PSU is an HX1000i, MB Asus ROG Strix Z790 - F, 13900K, MSI 4090 TrioX. All these parts are very expensive so I can't just use trial and error. Any advice would be greatly appreciated as I'm stuck atm.

 

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  • 1 month later...

Anything? 

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Alright, the most feasible thing I can come up with is that your capacitors are collecting too much charge leading to your motherboard's over current protection kicking in. Meaning the power is getting to the MB as you said with the LED, however it's stopping it from reaching the connected components. When you flip the switch, you trip the breaker. However, it doesn't discharge. You unplugging the PSU stops it from charging at a passive rate. Obviously, they fully charge when you use the PC and power it up. But, they do have limits. If that limit is reached it can cause issues. Electricity usually takes around 3-10 minutes to fully lose it's charge.

Your best option would be to take it to a PC repair shop, they can usually repair PSUs or at least take a look at it. If all goes to worst, you could get a cheaper (reputable) 850 watt PSU. It's within range for your specs, as long as you're not overclocking your 4090 to 600 watts, as it rarely reaches 450 without an OC.

Edited by Challyamua
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