2nd Clip died after charging

Mine is still dead. I have a 2gb clip, and it’s about a year old, or maybe 2 years old. I updated the software a week or two ago, though I have no reason to believe that contributed to the problem. I charged it up last night, listened to it for about an hour this morning, and again for maybe a half hour this afternoon and it just stopped. When I plug it into my computer, it remains dark, and the computer doesn’t recognize it. I tried holding the switch for 20 sec. That did nothing. How can I resurrect this old friend?