My ROG G20AJ shut down while I was using it. Now it's not turning on except spinning the fan for a second or two then stop. I tried removing the gpu and monitor but no luck. Now I reset the cmos but no luck either. Want to change cmos battery but couldn't find it on this system. Was hoping if anyone can point me toward the right direction or linking me to any page where they change cmos battery in g20aj. Thanks!