I recently shut down one of my desktop PCs, moved its power cord from AC power to a UPS, and then tried to power it back on. Much bafflement ensued. It had power (some indicator lights on the mobo), but I couldnt even get the mobo to try to power on much less post successfully until I reset the CMOS. Even the power button on the mobo itself did jack all, so I know it's not a loose cable to the front panel power switch After that, the mobo posted OK and the OS booted without issues. I kept all of the same bios settings (I havent touched these in ~5 years), and some testing shows the CMOS battery to still be good.
Has anyone ever seen this happen? I've never seen a CMOS reset do anything with a CMOS battery that's still good, and literally nothing changed aside from shutting it down and changing the power cable from AC to a UPS drawing from the same socket.
I recently shut down one of my desktop PCs, moved its power cord from AC power to a UPS, and then tried to power it back on. Much bafflement ensued. It had power (some indicator lights on the mobo), but I couldnt even get the mobo to try to power on much less post successfully until I reset the CMOS. Even the power button on the mobo itself did jack all, so I know it's not a loose cable to the front panel power switch After that, the mobo posted OK and the OS booted without issues. I kept all of the same bios settings (I havent touched these in ~5 years), and some testing shows the CMOS battery to still be good.
Has anyone ever seen this happen? I've never seen a CMOS reset do anything with a CMOS battery that's still good, and literally nothing changed aside from shutting it down and changing the power cable from AC to a UPS drawing from the same socket.
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