I bought a refurbished 17" macbook pro, and shortly after purchasing, the sound completely went out on this machine. There is no startup sound, all the input/output is marked on, and I can no longer watch videos due to the sound issue. I also seem to be having problems with it taking a long time to load any website that has a video attachment. This is my first Apple product, and I otherwise love the simplicity of it, but am really frustrated about having this problem. I'm trying to not have to invest more money to fix a machine the company I purchased from should fixed already, but long story there, am getting no where with support from them. Any advice or help is greatly appreciated.