My dell latitude d600 laptop has just been rebooted and i have no sound what do i need

Hi,

You just need to download the appropriate audio driver for your motherboard. Go to the Device Manager and install all missing drivers for "Unknown Devices". Either connect to the internet or use the driver disc which came with your laptop.

For those who doesn't know how to access Device Manager, please follow the steps below.

For Windows XP:
Start -> Run -> Type devmgmt.msc (in the box) -> Right click Unknown device -> Properties -> Driver tab -> Update driver

For Windows Vista and Windows 7
Start -> Type devmgmt.msc (in the start search box) -> Right click Unknown device -> Properties -> Driver tab -> Update driver

Hope this helps.