About two years ago I bought an " ASUS ROG STRIX G512LV " laptop and about two weeks ago I lost sound from inner speakers all of a sudden!! No damages at all in any way, and as I said all of a sudden!! I should mention that before losing my speakers, twice I had to push power button for 40s to turn on my laptop. So I decided to give it to be repaired in my region but they told me that the problem is from hardware and certainly main problem is from south bridge, They also told me there is chance of completely losing my laptop while repairing it, what should I do?! Is there any way to test it and fix it by my self ?