You know what else you can try. In the memory bay remove one dimm or move the dimm to another slot. When last did you clean your machine....the fan and so forth. Possible cd or dvd scratch can corrupt a file, run sfc to check. I've find some time ago that sometimes a underlining battery issue can cause alot of problems. Remove the battery and try again without the battery. Onboard mouse and keyboard can also cause issues. If the machine now fail due to battery removed the problem is the charger. Other than that.....I suggest you try something like win7 just to see if it's a OS or a hardware issue. Like a previous post, if you cannot login into safe mode it's most likely hardware. If you can go to safe mode then it's a software issue.
- Lenovo y50-70