Had it at parents for the week and took it back on train, when it powered on it got stuck at "checking NVRAM" and I left it about 10 minutes and nothing so turned it off at mains.
This time it got to a black screen but got past the bios screen.
I removed the mouse and keyboard and it got to the starting Windows screen then went black and stuck, same for the next 2 power ons.
According to google the best thing is to remove all things like pci cards and hard drives then reattach them.
Just wondered if anyone had any experience with this.
I am posting from laptop btw.