My unit refuses to turn on except for when being charged. I’ve tried the reset trick, nothing - and I’ve held it down for 20 seconds, 60 seconds and even 120 seconds. All I got was a cramp in my finger. The thing is barely used, maybe four times a year for the past 2 1/2 years. It is fully charged, I tried that for a full 24 hours today. Thanks for any help that anybody may provide. It’s a Sansa Clip ZIP model SDMX22