Both computers were stripped of everything but the main hardware to boot up.
The other PSU was hooked onto my computer, at the first several boots, it had the same problem we were attempting to fix before. Then it booted past the bios and then a checksum error occurred. After a restart, it booted properly, but no hard drives were hooked up as this power supply does not have any sata cables.
Are you as confused as me? At first, I was sure it was the motherboard, then the PSU, and then back to motherboard...now...I don't know what to assume if both the PSU and the motherboard are both functioning...