Macbook Pro Sound not working with HDMi

Hello, I have an early 2013 Macbook Pro on OS X Yosemite (10.10), 3 GHz Intel Core i7, 8 GB 1600 MHz DDR3. If you need more specifics about my computer, please let me know. I use an external LG monitor and separate external speaker, all connected through HDMI (I connect the speakers to the monitor, and the monitor to the computer using an HDMI cable. I find that sometimes the sound just cuts out sporadically and unpredictably. I'll be playing a game, and all of a sudden there is a pop and no sound thereafter. I have to restart the game in order to get the sound back. Sometimes I'm using Chrome and watching Youtube and the same thing. I'll have to restart the program to get sound back. Other times, I have to restart the entire computer because sound is missing from the entire computer.
I've tried switching the sound outputs back and forth from "internal" to "external monitor", with no avail. I've also tried plugging in my earphones (and the sound works), and unplugging them, and the external speaker sound still won't work. After a program or sometimes computer full restart, then the sound will work fine. What can possibly be the cause of this?
Thanks!

go to display, preferences, while the tv is hooked up to the computer. two boxes will come up, one for each screen respectively.
on the tv that you want to correct, go to color, then calibrate, and then change the colors through that.
Your tv may also not have the default colors on. you may want to look in your TV's setup menu and make everything go to default so you can start fresh and clean. Some TVs will save setting specific to an input and that would explain the weird colors.

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Macbook Pro Sound not working with HDMi

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