Question: This question had been asked multiple times but since they're almost older than two years, I will ask it again. The answers to those question couldn't help me either.

**My problem:**  

After logging in on my account I get a black screen. I don't even see my cursor. I did not change major settings and the problem occurred randomly. When I start a guest session, everything works fine.  

I don't know if it's worth mentioning but when I take a screenshot, I see two desktops in the output. Like [this](https://askubuntu.com/questions/411662/print-screen-captures-two-spaces-not-one). I don't have anything plugged in.

**Steps taken:** 

* The solution in [this](https://askubuntu.com/questions/449121/black-screen-after-login) question doesn't work. The file in the mentioned directory doesn't exist.
* Multiple answers on this subject mention (NVIDIA) drivers. As far as I know, no drivers have been installed/updated by me nor did I edit settings related to graphics. My laptop isn't Dual-Boot either and I erased the entire disk and replaced Windows with Ubuntu (through the Ubuntu installation screen). So existing drivers where probably deleted.

**My OS Type**: Ubuntu 16.04 LTS (regular), 64-bit

**My Hardware**:

Hardware: Asus laptop R500V  

Processor: Intel Core i5-3210M  

CPU: 5GHz × 4  

Graphics: Intel Ivy Bridge Mobile  

Graphics Card: NVIDIA Corporation GF199m [GeForce 610M]

I hope I've given enough information and I hope you can help me.

Answer: 
I found out why the screen turns black when I login on my personal account. It appears I have accidentally pushed a button that toggles between monitors/beamers when connected. When nothing is connected to the laptop the build-in screen still turns off. This is done by pressing `Fn`+`F8`. This is applicable for the **Asus R500V series** 

My thanks to the people who tried to help me. I'm in the process of learning Ubuntu and your suggestions/answers helped my understanding of the OS.
There are *many* possible causes for this problem. And thus, there are many solutions, some of which might work for someone else but not you.

That said, give this a try:

1. Open up `tty1` on the logon screen by pressing `Ctrl`+`Alt`+`F1`
2. Login at the prompt.
3. Then run these commands:

```
sudo rm .Xauthority
sudo shutdown -r now

```