My Lenovo Laptop has lost it's sound?

I have a Lenovo Essential G505 and ever since a Windows update to 8.1 the sound has stopped working - with earphones and without. I have been googling for hours and nothing has seemed to work. I've grown up with technology but I'm not exactly a whiz. I've tried what everyone has said.

Please somebody help - I use my laptop for netlfix and itunes a lot so this is kinda bad for me

Go to your device manager, and try to update your sound card. Its the only thing that I can think of. Happened to me but only with headphones, I actually broke the input.