Don't waste your money. If the data is really important, send the disk to a data recovery service to avoid risking further damage. If it's only somewhat important, use a (free!) tool like ddrescue to attempt to recover the data.
If you dropped your computer recently you can check the hard drive cables to make sure they are seated properly. Otherwise it appears your hard drive is toast.
Idk any tech support communities, but you should try booting into BIOS to see if your storage drive is detected. If not, it probably failed (read: it's dead, fam)
You could try to see if you can reinstall the OS but if the BIOS doesn't detect the drive, I doubt the OS setup will.
While the data loss will suck, a new drive isn't very expensive. Plus if you're still on a HDD, it would be a good time to replace it with an SSD.
Boot into your bios and check the sata mode. A number of machines that I work with(acer predators most notoriously) will for no discernable reason switch from achi mode to rst optane, resulting in no drive being accessible to the os. Switching back to ahci resolves it.
It does, but that doesn't cause the error. After failing to boot via pxe the system tries to boot from hard disk and that fails too. Bad HDD most likely
Is it a physical HD (magnetic) and making noise? I had one years ago (fortunately my only failure so far) and if I kept persisting to try and read it via a USB recovery drive, I managed to pull enough data off that was important. If it's a newer SSD, that's a different thing. Doesn't mean all the data is gone, just a lot harder (read $$$) to pull. Hopefully it's just software or a loose cable.