When you got 10 working initially, did you activate it? If so, you can download the Windows 10 ISO for free from Microsoft, and skip the portion asking for a Windows key. I am not sure if this will fix the issue you have, but it might save you from buying another copy.
I activated it, like always and it ran fine. What I am getting from everyone is that it will not support windows 10 and I know better because windows 10 first came out I downloaded and it ran. I had a problem when I crashed my computer and tried to reinstall. It takes so long to download that I run out of GB on my internet provided I only have 5GB of data on my hotspot and it runs out before the downloads