My computer is barely used .. brand new condition. I am the original owner and only user. iMac, 27in, Late 2013 OX X Yosemite Version 10.10.5 Processor: 3.5 GHz intel core i7 Memory 8GB 1600 MHz DDR3 Graphics NVIDIA GeForce GTX 775M 2048 MB Was surfing the net. The computer suddenly crashed. I turned it back on and now it makes a loud and constant static sound even with sound turned off. I play music or video and the static continues while the song or video plays in the background. This does not sound like a speaker issue. Can any of you tell me what is going on and how I can fix it.