Beep on cold boot. Is PSU good?

Hardware Hub PSU
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Hi, I replaced a defective PSU (eVGA Super Nova 1000W) with a Corsair HX1500i (call this new PSU “A”). The instability issues have been resolved… however… on boot the mobo (ASUS ProArt X870E-Creator WiFi with a 9950X) beeps for one second with the CPU Q-LED light on. The warning then disappears and the boot proceeds. The computer behaves stably after that.

I replaced the PSU “A” with an identical unit (call this one PSU “B”) and the beeps on boot became less frequent. Now it seems to beep only now on a cold boot, perhaps after a few hours of the system being down (capacitors discharged?).

I’m not discounting a mobo issue, but since the system is otherwise working I do not want to go through mobo diagnosis and a possible RMA process.

So, the question is… Does PSU “A” have an issue?

The context is that I’m doing a threadripper build where I’m using 2 of these. I’m wondering if I can use PSU “A” + PSU “C” in that build of if I should return PSU “A” and use PSU “D” + PSU “C”.

PSUs “A”, “B”, “C”, and “D” are all brand new Corsair HX1500i

Additional detail. I got “A” and “B” at a great price, sealed in the original box. These are original retail, not refurbished or used. If PSU “A” is good and I return it I feel guilty about it, plus I lose the “deal” I got on it which is about $120.

Is PSU “A” good to go?

Thanks!

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My biggest suspect would be RAM not PSU. Try re-seating RAM running only one RAM stick? Once you are inn there I would also reseat GPU if you have it.

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I reseated the Ram and tested it with MemTestPro to over 500% with no errors. This AM I booted without a GPU and no beep, but that could be just because the reduced power requirements. So Inhave reseated the GPU as you suggested and will reboot it again in a few hours. Will report :+1:

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I decided to go with “C” + “D”. When I opened “C” I noticed that the cable styles had changed from “A”. My guess is that “A” and “B” are 2024 models and “C” and “D” are 2025. So going with the same year works out better and I do not have to worry about “A” being defective or not.

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For the record the issue was not the PSUs themselves but the inrush current demand the PSUs were putting on the UPSs.

The power provided on a cold boot was insufficient during that initial demand and thus the beep by the mobo. After that brief period the demand stabilized and thus the computers would operate normally.

The solution was to upgrade the UPSs from 1000VA to 2200VA. And in the case of the dual PSU machine, two 2200VA units.

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