I also own an MSi Raider, but am not a gamer, I'm in VM and software testing.
Your talented cat stepped on FN + F6.
Tap FN + F6 again to remove it.
The F6 key on my keyboard even has a target on it.
It's for gamers who want accurate shots on weapons without a scope.
Also if you read down a bit someone heard their fans going full blast : FN + F8
In case the laptop is cooking but the thermostat does not detect it,
you can kick up the fan to high manually.