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you don't need a disk to reboot..
you DO need a disk to reload/repair the OS..
the only easy way to do this properly is with a disk from the computer's manufacturer.
this will cost a few bucks.
Get out while you can
Find your own path
I have an HP nx9420 laptop and the OEM boot disk if you need to borrow it.
There are all kinds of downloads off the HP support site as well.
2018 Harley Road Glide
2000 Ducati 900ss
shift F10 at startup to use the recovery partition
Friends don't let friends wave to Can Ams