Ubuntu – Microphone is not working in Skype

I am using Ubuntu 12.04 and Skype.

My mic is not working. I have 1 mic attached to the system and another one in my headphone (Beats by Dr. Dre).

I followed these steps:

Turn PulseAudio autospawn off, normally: $ echo "autospawn = no" > ~/.pulse/client.conf

killall pulseaudio

But this did not help me and it disabled my sound after my system restarted. I then tried

echo "autospawn = yes" > ~/.pulse/client.conf

then

pulseaudio -D

It fixed my system sound but still no sound on Skype microphone.

After that, I tried this command

echo "options snd-hda-intel model=acer" | sudo tee -a /etc/modprobe.d/alsa-base.conf > /dev/null

I've also upgraded alsa sound drivers by running:

sudo add-apt-repository ppa:ubuntu-audio-dev/ppa
sudo apt-get update
sudo apt-get install linux-alsa-driver-modules-$(uname -r)

however on the last command:

sudo apt-get install linux-alsa-driver-modules-$(uname -r)
[sudo] password for gaurav: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package linux-alsa-driver-modules-3.2.0-27-generic-pae
E: Couldn't find any package by regex 'linux-alsa-driver-modules-3.2.0-27-generic-pae'

When I type pulseaudio in terminal it shows me

E: [pulseaudio] pid.c: Daemon already running.
E: [pulseaudio] main.c: pa_pid_file_create() failed.

After all this, my sound system started behaving abnormally. Internal Speakers and headphone or 5.1 speakers both works at same time but still the microphone is not working. I even hear a noise when I don't play anything. It's freaking me out and my microphone problem is after 12.04 . Can I use my headphone microphone? I am having beats headphones.

Details of my system alsamixer

Even Now My system sound OUTPUT connector option is gone here is the screen shot