Yosemite caused my volume control to stop working right! Help!!

I have a mid-2009 15" MacBook Pro and since I've updated to OS X Yosemite everytime I go from sleep to back on, my volume control is glitchy and doesn't work. I have to restart my computer to get it functioning right every time. Sometimes the Audio settings are greyed out as will to where it can't do anything. Also, I have USB speakers and they used to switch back and forth fine from when they were plugged and unplugged back in in Mavericks, but don't anymore since Yosemite. Anybody else encounter this?? Any fixes??

This may be one of the rare occasions when you should repair the permissions of the startup volume in Disk Utility. Try that and reboot. If there's no change, continue as below.
Back up all data before proceeding.
Triple-click anywhere in the line below on this page to select it:
/Library/Preferences/Audio
Right-click or control-click the highlighted line and select
Services ▹ Reveal in Finder (or just Reveal)
from the contextual menu.* A folder should open with an item selected. Move the selected item to the Trash. You may be prompted for your administrator login password. Restart the computer and empty the Trash.
*If you don't see the contextual menu item, copy the selected text to the Clipboard by pressing the key combination command-C. In the Finder, select
Go ▹ Go to Folder...
from the menu bar and paste into the box that opens by pressing command-V. You won't see what you pasted because a line break is included. Press return.

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Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, or by a peripheral device.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode* and log in to the account with the problem. The instructions provided by Apple are as follows:
Shut down your computer, wait 30 seconds, and then hold down the shift key while pressing the power button.
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Hey @prakhar12 ,
We meet again!
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Let me know if that helps!
Please click the "Kudos, Thumbs Up" at the bottom of this post if you want to say "Thanks" for helping!
Please click "Accept as Solution" if you feel my post solved your issue, it will help others find the solution.
The Great Deku Tree
I work on behalf of HP.

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Yosemite caused my volume control to stop working right! Help!!

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