Mac has been freezing so i have to shut down. help!?

my mac has been acting really funny lately. its been slow when many operations are running, especially opening. also, sometimes the screen just goes down like a shade is being pulled over it and it stops working. once, i was watching a show online, and the entire screen went gray and a noise from the show kept... show more my mac has been acting really funny lately. its been slow when many operations are running, especially opening. also, sometimes the screen just goes down like a shade is being pulled over it and it stops working. once, i was watching a show online, and the entire screen went gray and a noise from the show kept repeating over and over. i dont know whats going on?!
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