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Power LED slowly re-illuminates while PC is off

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    Posted: 08 Jun 2023 at 1:50am
Will try to be brief. Mainboard, CPU, RAM were just moved from my main PC (where there was no such problem) to my backup (hand-me-down) PC after upgrades to Main PC. All functions perfectly, but after powering off (full shutdown, no sleep/hibernate/fast boot), the Power LED goes out (sometimes it doesn't even go out), then slowly comes back on.

If I hit the kill switch on the Antec TP750 power supply, the Power LED goes out, and does not come back on after turning the power supply switch back on...until the next boot and shutdown.

Things tried & failed: swapped out all power cables, SATA cables. Changed display port cable (google "pin 20 issue") to DVI-D cable. Disconnected all Case leads from MB headers except power switch and power LED and confirmed correct polarity.

Video demo: Behold the issue, and my chatty cat. I am out of ideas.
https://youtu.be/FZFqQ-Qz9q4

Hardware:
ASRock B450 Fatality Gaming K4 (bios v5.60) w/ Ryzen 5 2600
GTX 1660 Super via display port to Acer ED242QR Abidpx monitor
Antec TruePower 750 power supply (in both PCs)
Antec SX830 (bulletproof ancient ~2001 case)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Quexos Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jun 2023 at 6:07am
Solved: Seems there was a BIOS setting that got set to enabled. PSS Support (presumably stands for power saving sh**), changed to disabled seems to have sorted it out.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Quexos Quote  Post ReplyReply Direct Link To This Post Posted: 09 Jun 2023 at 12:02am
Thought it was fixed, but it came back on over night.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Quexos Quote  Post ReplyReply Direct Link To This Post Posted: 11 Jun 2023 at 4:33am
Solved...I think. It seems to be my 15 year old Seagate Baracuda 320GB hard drive had a problem. With that out of the system, all is well for two days/nights in a row. Sometimes it took several hours for the power LED to illuminate, so had to give it time between each change and test.
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