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The easiest way to clear the CMOS basically it will be by accessing the BIOS and press F9, that will set the BIOS to defaults, but since you are not able to access the BIOS try the following:
Turn off the system
Remove the jumper located on the motherboard
Turn the system on and you should be able to see a menu.
Press F2 to access the BIOS and then press F9 once you’re in the BIOS and press F10 to save all the changes.
I hope this can help you.