XPS 12 - No bootable devices.

I’m aware this has been already asked loads of times, but nothing’s working from the solutions I’ve seen.

When I turn on the laptop this meeage appears: ‘No bootable devices - strike f1 to reboot, f2 for setup utility. Press f5 to run on board diagnostics.’

I ran diagnostics and the it says no hard drive is found. Everything else is fine. I’ve tried all boot combinations in f2 but it just ends up with the same message.

So it’s the hard drive. I open it up, reseat it, screw everything back up again. It works, for about a day to a week, then I need to do it again.

Sometimes I get it working without opening it up, most of the time not. When I do get it working, it runs slow and says my hard drive is very full, though there’s not that much on it. I’ve cleaned up files and defragged, got rid of malware etc but it always creeps back up nearly full.

So I checked if my OS (windows 10) is corrupt. Haven’t been able to do updates lately because of the hard drive being so full. So I reinstalled it and managed to clear enough room to get it all up to date. It booted successfully for just over a fortnight, then resumed not working again.

I’ve had to reseat every day, then every time I turned it on. It sometimes booted with the screen turned upside round (as if you’d rotated it while using as a tablet) freezes and the ‘something went wrong’ blue screen appears. Now it won’t even do that. It’s sending me round the bend.

I’ve servued the hard drive as much as I can, it’s **bleep** down, it can’t move.

Is their anything else I can try myself to get it back up and running? Is the hard drive fried? Should I just recover the data?

I’d like to know what the issue is before I get the pros in. I don’t have warranty. Thanks.