I bought a new laptop from a Linux vendor some time ago. The machine is a beast and it comes with a SSD for the root system and a HD for the home system. One day, I noticed that I could not enter my session.
After some checking, I realized that the machine was not reading the HD. The BIOS did not show the entry for that drive. Weird.
Now, what do you do with a computer like that? Can you use it for working?
Of course! I could log into a session from the root system and work from there. Also, I could use my the clone of my system that I carry on a live USB pendrive. Thus, the problem, although weird, did not stop me from working.
Later on Mechatotoro took my laptop to a repair shop and, as I thought, it all was caused by a hardware issue: the HD had somehow gone loose. Once it was put back into place, everything was normal again.
What did I learn from that experience? That Linux is simply great! While another OS would tell you that you cannot use the computer, with Linux I could keep working although the home system was unreachable.