For solving your problem you have to first try to find any other source of internet connection like Ethernet or you can say LAN
step1- connect Lan cable to your netbook.
step2- type following command to start internet.
this will start a dhcp client for your Ethernet card i.e. eth0
step3- then type "apt-get update"
step4- after that you need to type "lshal" command and check whether it still detects the wireless or not.
to solve you sound problem.
step1-Go to "SYNAPTIC" in your system. if not install type "apt-get install synaptic"
step2- type at search bar "gsstream" and click on apply.
this will install the sound plugins for your netbook.
**UBUNTU boot screen .
plzz provide any further detail about this problem