Suddenly, the display turned bright white on my Acer notebook, Inspire 7736Z-4015 after 3 years of use; followed by a complete shutdown. Recently, warnings appeared that I had no free Disc Space left so I tried eliminating unneeded apps. I even put a 16GB memory unit to speed-up performance. Also, warnings appeared that the battery needs replacement but by using the AC Adapter, I was able to continue use. Is the problem that the battery completely died so the unit shut-down? Wouldn't using the AC Adapter have kept the power running? I hate to purchase a new battery if the battery isn't the real problem. Any thoughts?