Hey all, was wondering if there was a way to check the integrity of the OS? From time to time Zorin OS will go into a sort of boot-loop when powering on. Powering it off manually and turning it back on appears to fix this, but I'd like to see if there's something wrong with my OS install to make sure everything is alright.
For context, this OS installation was done with secure boot on an SSD. Laptop's a ThinkPad W540.
I believe there are a few tools available to technically do what you're looking for, but it's mostly in enterprise oriented distros, and not even they usually have them by default enabled (at least, the few years ago I fiddled with one, anyway). Generally speaking if something goes wrong, something somewhere will tell you... or your computer stops functioning. 
What you're describing is most likely a service getting stuck on boot that may or may not need to be enabled during the boot sequence, especially if it's making issues like this occur on a semi-regular basis. I think you'd want to look into journalctl to go through and see what possible services are causing an issue. There's a pretty decent guide available that I'll link that goes through most of the things you'd need to know:
I'll go ahead and take a look at that, thanks!
For me, it is Nvidia. I get this, too. It hangs at the splash screen and I need to reboot. Not often, but often enough.
You could try it with disabled Secure Boot.
Is this because you are using nVidia proprietary drivers? As you know I'm not a heavy gamer and only ever use Nouveau.
Yes. In my case, this is necessary. That being said; I am not opposed to something being proprietary in principle.
Mixing Open Source with Proprietary can be problematic at times.
I wasn't arguing a case for open versus proprietary. For me proprietary caused more problems than it solved.