Modem with green and red blinking

hello! im having a lot of issues with my internet connection, the problem started when the lights went out for a few minutes, then when it came back, the modem was blinking green and red like a christmas tree light, then i tried to reset holding the reset button for 20 seconds, but istill the same problem, i tried to reconnect everything and the problem persist a lot ( i reseted the modem like 3 times) what can i do?? i have a week without connection