My laptop isn't displaying anything

[latharambt78904]

I connected my phone with a USB cable to my PC. Then tried to transfer photos to the PC but couldn't since it took a lot of time just to calculate the time of transfer, then I just clicked cancel and in the task bar clicked close all programs. And removed the cable. Now nothing is been displayed except the background and the cursor.
Please and please help me with this issue as quick as possible.
Thank you.

 

[rgd1101]

Still nothing about a reboot ?