Sansa Clip 1gb (01.01.11F) problem

Good day Sir

I have a Sansa Clip 1gb (mp3) but my pc cannot detect the device… When i connect it to my pc ( and other pc’s) it will only charge itself but the pc cannot detect the device… I cannot open my folders and i cant add any songs to my device… can you please help me with this problem… 

Under the Clip’s settings, what is the USB mode set to?  Try setting it to MSC mode, which is the most universal and forgiving to system setups.