Since I'm the one that put it on hold, I thought the default reason was clear enough.
There are either too many possible answers, or good answers would be too long for this format. Please add details to narrow the answer set or to isolate an issue that can be answered in a few paragraphs.
There are a variety of reasons as to why a system can lockup and/or freeze, but still have some aspects to it which appear to be working, such as, I'm still able to type or move the mouse around; but the system is otherwise unusable.
For someone that's providing an answer to this question, they'd have to wade through a lot of assumptions to get to an explanation. These types of explanations are not really conductive to good Q&A content on SE sites.
BTW, there are actually 2 reasons that I closed this question, that was the first. The second reason is this question is actually off topic since it doesn't have anything to do with Linux per se, and would probably be better suited to the Super User site in its current form.
However I was hoping that you would expand it a bit, since I was assuming you had an actual Linux system, which would make it better suited here in the long run.
As a side note, the behavior you're seeing is indicative of how hardware is typically constructed with various sub-systems. These sub-systems give the illusion that a computer or electronic device is a single entity, but rather they're a multitude of sub-systems working together in concert.
But if I were to write this as an answer to your question, it would've just led you to more questioning (which would've been off-topic of U&L) and wouldn't have been a very useful answer to future visitors either.