there are black dots below some of my icons and I can't get any volume

OS X 10.10.1 Yosemite

Black dots under the icons in the Dock?

If an application is running, it is normal seeing a black dot under the application in the Dock.

Closing the window doesn't make the application quit.

Quit the application from the menu bar.

Sound

1.Plug in and remove the headphone.

If you see red light in the headphone port, plug the headphone

in and out of the port 5 or 6 times to flip the microswitch inside.

Sound output may be stuck in the digital mode.

2. Reset PRAM. http://support.apple.com/kb/PH14222

Do this twice

3. Reset SMC. http://support.apple.com/kb/HT3964

Choose the method for: "Resetting SMC on portables with a battery you should not remove on your own".