The Mac behaves as if the alt key is pressed, what should I do?

Question

macOS

The field of recent updates is java, iTunes, iPhoto, my poppy began to behave very strange, everything seemed to be holding down the alt key, although I turned off the keyboard, removed the punto switcher, but this did not help. The problem after a while was solved by itself, but after a few hours it happened again. What is it: a hardware problem, a virus? Maybe someone came across? Tell me please!
Additionally, a blue screen appears during boot. Here is the video www.youtube.com/embed/HMwfGGDsIYY

Answer 1

hmm, strange, today at work I caught a similar problem. true os windows, system reboot saved.

Answer 2

According to the description, it looks like a hardware problem (the key sticks).
You can check it by booting from the live distribution and working for some time (usually if the key sticks, then it sticks after an arbitrary number of clicks). Cleaning or replacing the keyboard should help.

Answer 3

Now I went into guest mode, there are no problems, everything works fine. Tried another keyboard, problem persists. Now only the browser is open in guest mode and everything works fine. Does it make sense to check for viruses?

Answer 4

Checked for drweb viruses. Didn't find anything. It does not fit in my head, which can be, since it works in safe mode.