Window7 login black screen solution

problem description: Today, the network company's master came to my home to repair the network, do not know what drive is installed, my home computer
restarted, there is a black screen
Everything in front is normal, wait until the login screen appears, and then enter the black screen, the screen has only a white mouse pointer. The mouse slides normally. Press ldquo;ctrl+alt+delete” can jump out to the login interface. No other operations are restarted. Press F8. Select “Safe Mode” Enter, after logging in the screen, it is still a black screen, only the four corners display "Safe Mode", the top display version. Still except for jumping out to the login interface, nothing else happens. Workaround:
There are many ways to do it elsewhere on the web. However, the problem now is "all operations fail", then you can try the following method.

1. Restart the computer
   
2. Quickly press F8 when entering the boot interface
   
3. Select “Repair mode”Go to
   
4. In “Select Recovery Tool” Select “System Restore&
6. In the dialog that appears, find the previous backup (as long as the system is updated a few days ago, there will be a backup)
   
7. Then select one of them Back up the file and start the restore, as shown below:
   
8. 
   
9. Restore, restart and enter