Smart Error BIOHD-8 on boot

Searching around a bit on the internet, it seems the error code BIOHD-8 you are seeing is an error code that HP computers display when the hard disk is reporting problems (modern hard disks can tell the computer if they do not "feel well", and SMART is the mechanism a hard disk uses to report problems to the computer.

It is not clear whether the hard disk is really faulty, or whether the error is a false alarm. At any rate, it is unwise to ignore the error.

You should:

1. Make sure that the backups of your system are working and up-to-date (you do have backups, don't you?)
2. Take your computer to a repair shop and have it checked out - it may need a new hard disk. You can do this yourself, but it requires some computer knowledge, so only do it yourself if you feel comfortable with it.