Lenovo IdeaPad Z585 Not Booting Windows 7?

I recently left my laptop charging in sleep mode for about 10 hours, and then opened it to see a bluescreen. I shut it off and tried to start it up, and got a black screen after a short loading bar. It then gave me the option to repair, but after seeing "Loading Files," I got another black screen, sometimes with a mouse pointer, but nothing else. The same happens after trying to load Windows normally.Eventually I figured out that if I leave the screen on the black repair screen for a while, it will progress to the blue-ish background screen shown at the login, but the square that you click on to select my account doesn't appear, and my pointer is in a weird resolution. I can't progress beyond this screen.Last night, I was getting some weird freezes when I plugged in the charge cord, where the display would lock up for a few seconds after plugging the laptop in. Also, a few days ago, my computer started running really slowly and overheating, and eventually crashed with a shutdown. It crashed when I tried to start it again, but the second time, I ran it in repair mode and I was able to start up without issue.I've tried a number of things, but there appears to be no problems with the memory.