Please proceed with the following steps:
Make sure BIOS version R0300Y8 or higher is installed.
This can be done either by using VAIO Update, or by downloading and installing the latest version manually.
This BIOS update will add the option CPU C3/C6 SUPORT in the BIOS.
Disable C3/C6 Support in the BIOS:
Reboot the computer.
Press F2 multiple times at boot.
When the BIOS setup screen appears, use the arrow keys to browse to the ADVANCED tab.
Move down to CPU C3/C6 SUPPORT, press Enter, select DISABLED, and press Enter.
Use the arrow keys to move to the EXIT menu, select SAVE CHANGES and press Enter.
Please note that disabling CPU C3/C6 support will reduce the optimization of your VAIO's battery life.
For more information and/or other models please refer to: The computer makes a strange or strong fan noise and/or emanates a lot of heat