Grey screen and cursor only and ctrl alt del doesn't work? What happened?

[Microsoft Windows]

After accidentally spamming the mouse on roblox because it wouldn't open and I was not in a great mood, every app shortcut I had was glitching out with a black square on it and then my computer went Grey. Ctrl alt delete doesnt work and my mouse is there. Every so often razer starts up and then dissapears. Help!

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