LEAGUE NOT WORKING

Guys, someone please help. I recently re-installed league and I had uninstalled just 2 days before and it was working perfectly. Now, I can't get into a game anymore. I can get into client and champ select just fine, but when it actually comes to getting on the rift, the screen just goes black. And when I click around I just get a *bing bing noise. I play on a Mac an I've never ever had this problem before. I even tried uninstalling and re-installing numerous times and it still doesn't work. HELP PLEASE!