I'd suggest manually resetting the BIOS settings with the reset jumper. You should be able to find the location of that in your motherboard manual. Also, I don't know the motherboard's specs offhand, but it's possible it requires certain criteria to be met before it will boot to prevent overheating of the processor. Some motherboards require a fan to be functioning on a specific motherboard connector, some require a certain temperature. If there is any protection like this on your motherboard, ensure there's no way that could be holding up the boot.
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