no manual with this one as i got it off ebay a year ago.  but i did get lucky with it, and its now working.  as a last ditch attempt, i took the back cover off, sprayed it down with electrical contact cleaner, blew out with a blow gun, and walla, back to normal.  i did loose all my programs, but no big deal, data was on a sd card, as was the main program.  just a matter of popping the card back in and resetting it.  all is well again, for how long i don't know, but hopefully it will get me though bean planting if it ever quits raining and drys out.  thanks for all the advice