My computer screen keeps flashing black, it's on a very low brightness level and i very rarely put it up to high level unless i really need to. what could be causing the problem, and what is the solution?

Simon says is a memory game where "simon" outputs a sequence of 10 characters (r, g, b, y) and the user must repeat the sequence. create a for loop that compares the two strings. for each match, add one point to user_score. upon a mismatch, end the game. sample output with inputs: 'rrgbryybgy' 'rrgbbrybgy'