My problem was the “power off button” slow to response or not at all.
Best Advice: The “hard to open case and PRESS” the plastic hard and harder; after it might get small dents on the plastic cover, but it will get it open (BTW I did use a spatula or same called knife for plastering, worked great) . Once opened: I did clean wit a q-tips with alcohol an oily spot under on the “power and pause” buttons. Put it back together and voila!, worked GREAT. Thanks so much for this advice and post.