2GB Clip

I am having problems getting my clip to stay powered up.  I connect it to the USB port, but will only stay on a few seconds before shutting down.  After a few more seconds it powers back up.  I know it is shutting down because my computer sees it and then does not.  It will not stay on when unplugged from the USB connection.  There have been several posts to reset it back to MTP or MSC.  It will not stay on long enough to make any changes.  Very frustrating.  What is the problem?