Inspiron 7559

I've had this laptop for about a year and a half, and it's been working in pristine condition up until about a month or so ago. I suddenly kept getting the error message above when booting, and for a couple days would go between recognizing the battery, sometimes charging, then eventually not...

This issue is driving me completely insane. About a month and a half ago, the screen on this laptop went very dim. I had been using the laptop when I left my apartment to go and do something. I didn't shut the laptop off or anything, and when I came back I noticed that the screen had gone black...