What’s the “sansa clop” and what does “sansa clop power on and off” mean?
Try a different USB cable and try a different USB port; if you have a laptop, try a port at the back of the computer rather than the front. Plug directly into your computer, not through a USB hub.
And you can try charging via a wall outlet, with a USB AC adapter.
Does you player still play when not attached to your computer?
