Computer won't start - black screen

Hello,
So, I was away from home for 10 days. Yesterday I turned on my computer, everything worked just fine, turned it off and everything worked. Today, I wanted to turn the computer on to work on some stuff and everything started up normally, got the log in screen and all. So I typed my password and it took way more time for the computer to check everything. When it finally logged me in and all that, the whole screen is black, with only the coursor on the screen. I can still access the file manager and all, but the screen is all black. If somebody knows how and if i can solve the problem myself, help would be appreciated.