Problems with Ranger Maximus VII (00)

[NoahReznov]

I'm new to this forum and not really sure if I'm posting this in the right place lol...

I have a Ranger Maximus VII motherboard that a friend gave me because it wasn’t working in the first place... I’m studying to become an electronics technician, just so you know, and in case someone can suggest what to check on the hardware side of the board.

The issues it has are:
It powers on, shuts off, and then turns on again but doesn't display any image.
The CPU doesn’t generate any heat.
There are no beeps from the buzzer.
The CPU light near the 24-pin ATX connectors lights up.
On the two-digit debug display, it only shows “00”
The last time I tested it, it got stuck in a loop: it powers on, turns off, then powers on again in a cycle.

I checked the voltages going to the BIOS and they were all normal. I also flashed the BIOS (the original one), and it reported that the flash was successful.

With this motherboard I’ve used the following components, all of which I know work perfectly:

Generic and non-generic power supplies
A 4GB DDR3 RAM 
An i3-4160 CPU
A dedicated GPU to rule out onboard video output issues

I also used a diagram viewer for the ASUS RANGER MAXIMUS VII to check connections and expected voltages, but eventually, I got frustrated and tired, and I had no idea how to continue troubleshooting...

I’d like to know if anyone has any idea of what I could do or start checking, since buying a new board isn’t a valid option for me. I really want to find the root of the problem.

[Nate152]

Hello NoahReznov

If the motherboard wasn't working when your friend gave it to you, you might not have much luck in getting it to work.

Double check you have the 8-pin cpu power cable connected and fully seated.

If that didn't help, carefully inspect the the cpu socket with a magnifying glass for any bent or misaligned pins.

[NoahReznov]

Yes, I know it wasn't a great idea, but he was selling it because it wasn't working and he didn't know how to fix it. He's also an electronics technician, and I wanted to try my luck and see if I could fix it and pay less.
Regarding the power supply, I connected the probe to the 8 pins as you said, but it's still in an on-off loop. Now I'm checking the pins one by one with a multimeter to measure continuity, and so far there's nothing... Any other ideas?

[Nate152]

How does the cpu socket look?

You can post pictures if you like.

[NoahReznov]

Sorry for not responding in such a long time. Here's a photo of the socket. The pins aren't very clear. I've been looking at them with my phone's camera and they seem fine. However, if you want to tell me how to take a good photo of the pins, I'll be happy to do whatever you say.
On the other hand, I was thinking it could be a problem with an oscillator on the motherboard, and I was going to try measuring them with an oscilloscope, but I don't have one at home. They're at the school I attend, so I'll test them next week. I'm still trying to figure out what the problem could be.