Knetwork Manager Stopped Working!

What happened was my Laptop was dying and so i went to shut it off and it hung, so i hard shut it. later on i plugged it in and started it up, which i when i noticed that my wireless wasn’t working. the light indicating my wireless was activated was off, and knetworkmanager could not connect. i then tried to go on the internet via a wired connection, which did not work. i was going to try the traditional ifup to connect to the internet, however, i did not have the smpppd package necessary to do so. Please help me.

I have an ACER 4540 Laptop, and i have no clue what the specs are on the wireless card, and i have tried to find them