Looking at your ebay link there is a cmos battery seated on it in all the pictures except the first one with the green light. If I am correct it probably is a CR2032 battery by the looks of it. There are some boards who have difficulty with posting without a cmos battery. The cost of a battery ia just a few pounds or pence. Always start with the basics first.
https://i.imgur.com/3LKpAAn.jpgSo, in the end, did you solve your problem here?
It can be complicated when you did that there was no experience with hardware. even if you get all the tools that other users have suggested to you, that doesn't mean you can easily solve the problem.
