deathstalker v2 tkl some keys not functioning and does not work wirelessly

hi  the keyboard doesnt work properly.  even now i cant make new lines because enter doesnt work.  this has nothing to do with the windows settings as this issue happens in the bios too.  the wireless dongle also wont show up for long enough in the pairing mode.  these items are in perfect condition and have been stored in their boxes when not in use. i have all existing wrappers even.  i am so disappointed as my original deathstalker worked like a chamr for years and never gave me any issues othjer than a sticky key                                                                 order number is rzgbwp1000001065661