2000 Pontiac Grand Am My lights are all gone, inside and ou

Hello, last week all the lights went out completely in my car. This included my inside, dashboard lights and also my outside lights, my front and rear and my fog lights. Also no blinker signals. My heat kicks in and out, with a hit on the dash, right above the middle vents and the stereo. It seems like a shortage. Got the fuses replaced last week, but no difference. Please help me!