Reign Sentry Core MKII Won't Boot Windows

So I received the PC a week ago and I’ve been having issues with it not booting Windows. When it doesn’t boot it shows the Reign / Novatech screen then the signal goes from the monitor. Other times it will show that screen with the loading dots which struggle to go around and then it will 'ode signal again. Most times it takes several hard resets of the power for it to boot properly. Don’t really want to send it back as it’s taken ages for me to get all the files on it. Does anyone have any suggestions? Any help would be appreciated.