I have 2 5007 recorders. Both went out at one time with a similar problem.
The units would go on and off continually. I managed to get one working by
installing the new firmware. I could not do it with the other one because it
doesn't stay on long enough to accept the firmware. I sent the second one back to Liteon and they sent me another on. Anybody know of a way to fix this in case it happens again.