The casino doesn't see anything of what you see when you play a slot game. The only thing that can be seen from them is the placement of your bet, the bet amount, and in which game you bet on. Since you continue to press the spin button, the game records your bets no matter what other issues you had on your end/ screen. Even if your screen was blank, the result would be the same. Next time that you face such problems, better to close your laptop or just exit from the game.