Clicking noise but won't start. Tried to jump start the battery but didn't work

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Sometimes it will start but today it won't turn over at all we tried to jump start it and didn't work. You can hear clicking noise and the speedometer needles vibrate but nothing will turn on. I can't unlock the doors with the key fob. The times it does start sometimes the electrical stuff flickers the lights and radio go in and out and it steals offs and on for a bit then it's fine. Pleaser help