Win7 system activated still black screen?

In the first step, after the system starts, use the shortcut point to start Task Manager "Ctrl+alt+delete" and click "Start Task Manager" (shortcut "Alt+t").

Second, when Task Manager comes out, click "File"-"New Task (Run ...)".

The third step, after the Run window input "control" click OK.

Fourth step, you will see the control panel out, find "Device Manager" and click on it. (If you are not accustomed to Win7 Control Panel display, you can change the upper-right corner of "view mode" to "large icon" or "small Icon")

Fifth step, find "display adapter" in Device Manager and click on it, then right click on your video card, select "Uninstall".

The sixth step, in the pop-up dialog box, will "remove this device driver software" Tick, click OK, uninstall.

The seventh step, after the uninstall completes, restarts the computer, can solve (may need to reboot two times).