computer turns off when in sleep mode

Hi,

Try the following,

Go to Start. In the search box type "Device Manager" (without the quotes) - and then press Enter; this will open up the Device Manager. Double click on 'Universal Serial Bus controllers.' Now you will see a list of 'USB Root Hub'. Right-click the top one of these and select 'Properties'. Click on the Power Management tab, un-tick where it says 'Allow the computer to turn off this device to save power' and click 'OK'. Now repeat this action on the other 'USB Root Hub' items in the list. when they are all done you can close the Device Manager, and your USB mouse and keyboard will now be able to re-awake your computer.