I've had this radio for a few years - lightly used. I haven't used it for about 4 months. I recharged the battery and when I turned it on the display backlight comes on and the radio boots - that is, it "talks" to me - but the display is blank. All the keys and functions seem to work as I cycle through the keys and change channels and it transmits & receives - just no display. Has anyone experienced this and is there a key combination to reset to factory default (as a last resort) prior to tossing the thing? Thanks.