Me and my friend are swapping both the motherboard and Cpu from our computers with each other. Intel i3/Msi mobo and a i5/Asus mobo. Both computers work perfectly with their own parts but as soon as I replaced the i5 pc with the i3 cpu and mobo and turned it on, it started up for a split second then shut off immediately. I reverted the motherboards back and both computers are working fine. Any suggestions to why this may be happening?