Problems with importing photos

Hi! 

I'm having some issues trying to import files into lightroom. I've had it for about a week, when I first got it I accidentally clicked import all photos from a folder which had 600+ images on it. It didn't even start downloading the photos, instead sat on the "activities in progress" bar for about 3 days and hasn't let me import anything since. I have pressed cancel on all the imports and it won't start to cancel them either (the progress bar is empty). I have tried restarting and shutting down my MacBook but it gets "interrupted by lightroom", the only other thing I can think of that I haven't done yet it uninstall lightroom and then reinstall it. 

If anyone has a solution please let me know! Thank you. 

- Milly