Did you recently re-install the operating system or repair it?

I saw the one for CD-RW/DVD SN-308B. Maybe you'll have to enter your service tag or maybe there is a disk that you have for the other one. Drivers and Utilities disk?

If so, please download the drivers and install them in this order from here

Desktop System Software or Notebook System Software
Chipset or SMBus driver
Processor Driver (if applicable)
Video
Audio (sound)
Input Drivers (keyboard/mouse)
Modem
Network Card


Rick