My laptop sony vgn-nr120e

Some times when I restart my computer the mouse(touchpad) nor my keybaord will work, i mean nothing no caps nor ctrl alt delete, num lock.... nothing. so ill boot with a startup disk (itll finally work) and system restore to an earlier point. then itll be ok for a bit, few days or a week. then do it again. there are no virus's or anything. already installed reinstalled updated the drivers and windows. Another problem ive been having hapening around the same time is my comp wont read my recovery disks so i cant reboot to factory default? had old ones made new ones they wont read(recovered befor with the old ones). but my disk drive works fine, reads data,music,movies, burns great etc...(this is all the time it wont work). The only thing i can really think of is a mobo problem or something internal?(never beend droped or hit hard been babied) Any help would be greatly appreciated!