USB writing... unrecognized device

This is my exact  problem, although I really do not understand your technical explaination.  Can you tell me how do do the power drain thing and why SanDisk will not give a satisfactory answer to this obviously common problem.  I am so mad they will not do a live chat for an MP3 player that retails for close to $80!!  I have searched the internet and so one seems to be able to solve this issue.