Is it the cpu or the motherboard?

Hello, I'm wondering whether the motherboard or the cpu is dead. I tried to install a hard drive and a floppy drive to a biostar motherboard (G31M7TE ver.6.0). In any case, upon installing the hard drive and floppy to the motherboard I powered the computer on using an ATX 460W power supply; the only things that turned on was the cpu fan and the system fan. I attempted to turn the computer off via the power button and could not do so. Is the problem with the cpu or is it the motherboard?
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