Media Keys stopped working after upgrading to Yosemite. Tried several things, what to do?

I have a Late 2013 Mac Book Pro. After upgrading to Yosemite, my media keys (F7-F12) seemed to be working funny. They worked sometimes but not during others. A simple web search seems to indicate that Chrome is the culprit which I believe is the case. However, the instructions to disable Chrome from messing with the media keys does not seem to work (as my version of Chrome does not seem to have preferences to allow me to turn off its access to the function keys). The make things weirder, when System Preferences > Keyboard has the "Function Keys" option turned on, the media keys do not work (in fact F11 clears the screen to show the desktop). And when the option is turned off, the media keys work normally as though they are turned on. Additionally, when F11 and F12 are pressed (to lower/raise the volume), it no longer plays "test sound clicks" to indicate the changed volume. I have tried a PRAM reset to no avail.
Any help is appriciated.

For my hard drive that doesn't show up at all, the problem is not Yosemite per se. It's the USB3 driver incompatibility. Try using a USB2 cable (micro USB just like an android charger cable that plugs in half of the slot on your hard drive) and it will work. Or try connecting it to an older computer that has USB2 ports on it (with the original USB3 cable) and it will work BOTH on Yosemite and Mavericks. Of course it will transfer data at USB2 speeds. Apple screwed up the drivers again so we have to wait for them to 1. receive thousands of complaints 2. wait for eternity to acknowledge there's an issue. 3. take their sweet time fixing the USB3 drivers. Until then you can get by with USB2 cables. I hope this helps!

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Media Keys stopped working after upgrading to Yosemite. Tried several things, what to do?

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