Land Rover Forum - HELP! I can't get it running!

I am a new member so I'm not quite sure how this works, but I'll give it a shot. My 95 Disco needs some much needed help. It was running fine and then sat for a few days without being started. The next time I went to use it, it turned and turned and then sputtered to life. It ran fine the next few days and then it sat for a few again. This time it cranked and cranked but didn't start and now doesn't turn over at all. I tried jumping it off of my wife's car, but it still wouldn't turn over. I have had the starter rebuilt in the last year so I don't think that's the problem, but I don't think that there's enough juice to turn it over anymore and am thinking that I may have burnt out the starter by cranking it too much. Other than that I am thinking that I am having vacuum line issues? Has anyone else ran into this? Any help would be greatly appreciated. Thanks!!!