The issue may be caused eg by a corrupted graphics driver. In this case, appropriate troubleshooting steps include:
* Reinstall the graphics driver. Reinstalling a separate driver can be done through the VAIO Recovery Center options.
* Check for ++driver updates++. Especially graphics driver and BIOS updates are related to this.
* If the problem started recently, ++restore the system++ to a date before the problem started.
* Check Device Manager for
* Run a complete system recovery. Instructions for this can be found in the ***Troubleshooting and Recovery Guide*** that came with your VAIO. It can also be located in the ++Documentation++ section.