Try this: with the Clip OFF, slide the power switch down to the hold/lock position (orange showing).
While holding the center button depressed, plug in to your computer. See if the display shows “connected”.
On the computer, open a Windows Explorer window by pressing [Windows key] + E, or go to My Computer.
Is the Clip shown as a flash drive? Double click on it to see if you can access the root directory. You will see a series of folders here, Music, Albums, and a few files. The Explorer “box” in this view represents the root directory.
You will see a file here called version.sdk. Don’t edit this file, just right click, and open the file with Notepad. Here’s a sample file:
#DO NOT EDIT OR REMOVE THIS FILE
The FW line shows this as a revision 1 Clip. Note that the version begins with 01. Close the file.
Then go to this thread for a new copy of the Clip Firmware.
Follow the directions for manual installation, and download, then unzip, the firmware to your desktop. Drag and drop the m300a.bin file to the Windows explorer box (root), but DO NOT place this binary file into any of the folders.
Once the file is transferred, slide the hold switch back to OFF, click on the safely remove device icon in your taskbar (bottom of the screen), and unplug the Clip.
The Clip should display “firmware upgrade in progress”, and should now work normally. Try powering it up.