What's with the grey screen telling me to power down?

So this has happened several times recently where after I've runned some programs, then this grey screen scrolls in with the power button symbol, telling me to shut down. I'm just wondering if this has something to do with my hardware or battery or power supply?
I've thought that I should run the hardware test, but I can never get it to boot up. You're supposed to hold down the option button till the startup manager shows up, right? But the screen remains black when I do it. Is this somehow related to my other question?

Welcome to the Discussions.
That's a kernel panic.
Resolving Kernel Panics can help solve it.
John

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