Why is there no video output after starting the VAIO computer?

There is no video output after starting the VAIO computer.

The occurance of this symptom may be due to the following reasons:
- The video resolution exceeds the monitor specification.
Please reset the video resolution to the default values.

- The video refresh rate exceeds the monitor specification.
Please reset the video refresh rate to the default values.

- An incorrect video driver has been installed.
Please check that the correct video driver is installed.

User can also restart the computer in Safe Mode or restart the computer to see if the symptom occurs again.