Hi Blue_Moon30,
Changing the power option plan might help, please follow the below mentioned steps:
- Click “Start” for Windows 7 (or) Access the Control Panel; use the Charms Bar in Desktop Mode for Windows 8.
- Select” Control panel”.
- Select “System and security”.
- Select “Power options”.
- Select “High performance”.
- Restart the system.
Now check the brightness of the LCD screen.