Facebook Marketplace Mystery PC for Repair - No Post / Reboot Loop Diagnosis & Troubleshooting

In this video I will be inspecting, testing and troubleshooting a computer that I purchased from Facebook marketplace. This PC was listed with minimal information and no specifications at all or details of the fault other than "Computer for parts or repair" with the description saying "might need motherboard".
I chose to take the chance on this system as I liked the Bitfenix Prodigy M case it is built in. I could also see that it contained a PCI WiFi card and dedicated graphics card of some description. Not sure at that point if it could have been a lower spec gaming PC system.
I'd also noticed USB3 and HDMI ports on the motherboard, meaning it should be 'relatively new'.
Given that I figured it was a worthwhile gamble in parts that would 'probably work' to get my moneys worth. Since it could also potentially contain a power supply, processor, memory and SSD or hard drive, but of course that is unknown from the outside.
Will this computer be complete?
Will it turn on and function?..
Let's find out....
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- TIMESTAMPS:
0:00 - Intro
0:05 - Inspection & Background Story Info
2:27 - Initial Power-on Testing
3:55 - Opening The Case To Identify Components
7:30 - Removing Components To Troubleshoot
9:32 - Testing With Onboard Video Output
10:40 - Further Removing Of Components & Wiring
11:20 - Installing A Motherboard Buzzer Speaker
11:58 - POST Error Beep Code
12:41 - Testing Beep Without RAM / Memory Installed
13:23 - Trying Memory Module In Different Slot
14:07 - Trying A Different Memory Module
14:33 - Successful Power-on / POST Beep
15:23 - CPU Information In BIOS & Valuation
16:07 - Reboot Test Before Reinstalling Components
16:27 - Re-test With Both Memory Modules Reinstalled
19:09 - Reconnecting Wiring & Front Panel Headers
19:50 - Installing Graphics Card & WiFi Card
20:59 - Final Power-on & Windows Boot Test
21:40 - Windows Loaded Up & Finishing Summary
Video recorded in 4K Ultra-HD using an iPhone 6S.

[@RojCowles]

Probably a really long shot but might be worth checking if that RAM stick is still under warranty. Good video and great score of a pretty decent mid-spec custom PC for short money!

[@NathanPH]

I do doubt it would still be under warranty unfortunately, I think they would require proof of purchase to get a replacement too - I've been asked for it before when returning other PC items for replacement.
Thanks for your feedback! It was indeed a good buy - I figured that even if the motherboard was dead I couldn't really lose given the additional components I could see. Just need to decide what I'm going to re-purpose it for now! 😎
--Nathan