Lol not responding after i closed it(Mac)

Well, i close my computer with lol open on accident, come back realizing i forgot to close it, close lol. I come back to reopen lol later. It just says, "League of Legends is not responding". I delete and attempt to reinstall. I try to open up reinstalled version. Nothing happens. It says "League of Legends is not responding" again! WHAT DO I DO!