Crash.

So, my computer always crashes when i put it on stand-by but my father doesnt know that. I was playing minecraft and then i had to go somewhere so while i was gone my father put my pc on stand-by so it crashed... When i started it back up everything seemed fine untill i opened minecraft again. All my servers from my server list were gone, but that is not the biggest problem, when i open a world in singeplayer (not make a new one) it gets stuck on the 'downloading terrain' screen for a VERY long time, then when its finally done it loads up the world but can only see one frame and then it runs out of memory or just freezes until i close it...

I think im gonna try and reinstall minecraft and hope it works normally again D: