V3.0 Intel S5500BC Boot Power Fault

I’ve been piecing together parts for a v3.0 build for quite some time, and am just now starting to assemble it. I bought a E5506 to use for updating the bios and inserted it and two sticks of ram to see if it would boot. Upon powering up, I got a 1-5-4-4 beep code, which, according to the manual means:

“Power control fault (Power good assertion timeout) - Power unit sensors – soft power control failure offset.”

I’m using a brand new Seasonic PSU, so thinking I got a dud, I pulled a PSU out of a working system, and still got the same fault. I also tried changing to CPU and different RAM sticks just because, but no change.

Does anyone have any ideas? Thanks!

Are you using the correct power plug for the cpu? Sometimes they get mixed up with a pci-e power connector.