Linux install went horribly wrong

Hey there... I'm in trouble...

I wanted to install a Solus MATE distro, because it is supposed to work well on older PCs... So I put it on a USB drive, and lauched a clean install... Erased everything that was there after a backup...

But when it was time to restart, the PC did'nt even see the hard drive... The only boot options are now the live USB drive, and the firmware boot...

So I tried restarting without the USB drive inserted, and the computer did'nt even know what to do...

Not being a technical guy, I'm at a loss here... And it's been a week! :/

I even posted questions on other Linux forums, but not luck so far...

I tried reformating the hard drive, but Gparted gives me a list of formats that is a mile long... I have no idea what those are...

Here's a screenshot: https://postimg.cc/QBGN2YqC

But then again, maybe it's not even a format problem?!

A little help please?

Thanks for reading