My Intel PC did something weird today. It would not respond to the power button. I managed to shut it down from the OS but then could not get it to power on. I reseated the front panel connector but that made no difference. Next I reseated the motherboard & GPU power cables and now it is working again. Checked the temperatures and ran a few tests, all seems fine...
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Don't overlook a bad power button, my previous build the power on button on the case stopped working, finally figured out that the button itself was going bad, I replaced it and it never gave me a problem again after that.
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Most probably a frozen FIRMWARE of a LAN card (or, most often: of an M.2 PCIexpress SSD = connected DIRECTLY to the CPU !!! ).
This can do many *VERY* strange things.
ONLY a COLD START will reset this state (after disconnecting power cable from the PC for at least 30 seconds).
Solution: see IF there is an updated FIRMWARE for each of M.2 SSD *and* for your MotherBoard. (after the update, do not forget to update the Chipset drivers too --- download the latest stable CHIPSET driver directly from AMD.com… See More
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Never seen them work themselves loose like that
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