Have you turned off the power settings in the BIOS? If not, start there. You enter the BIOS settings by hitting keys before booting starts, just after power on. Hardware varies, a lot of the BIOS's flash information on the screen about what key(s) to press. If you don't see it, consult the documentation for the system, or look it up on the manufacturers web site. You could also post the hardware you are dealing with, someone here may know how.
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