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The H4 has a problem with the inside back circuit board disconnecting from the main board. For that you have to take it apart.
Pretty easy for anyone technically inclined. If I remember, 4 screws.
Carefully, of course. Inside you will find the back board (where the power and audio inputs are) unplugged from the main board.
Plug back in, and put some kind of piece of rubber or even cardboard (I did that) retainer to put pressure on and avoid this happening again.
It is a design problem, I had to find out myself.
Hope this helps, please let me know...
Hello ! Actually what you do is download the latest firmware from the ZOOM page. Find HANDY H4 (you can Google that) and go to the Download tab. Follow all instructions. Be sure to have new batteries or be plugged in to AC while you reset. I've done it on my H4(I have 2) and H4n and it worked fine. Be patient, it takes a while once you start. Good luck !!
Probably two years too late, but I recently got a used H4 and it was having this same issue. Upon reading the documentation, it seemed as though it required a specific type of AA batteries. If you update the firmware (mine was 1.3) to the latest version (currently 2.4), you can toggle the battery type under the menu (most likely alkaline is what you want). It also added lots of other great features!