[mtaman02]

Mouse may just be wear and tear (espicially the tap pad). As for sound a setting may have been changed in Windows or the BIOS preventing the sound from working. You could always go to the Lapto Manufatures website and re-downloading the Audio Driver for your laptop and the mouse / tap pad as well. If that works then its all fine and dandy. If not prep your laptop for formatiing (get copies of all your documents etc...). I have not had much luck with Restoring the system to the last known good date only b/c not many people know about it nor do they know how to work it properly. But it's always a shot. Restore the system to its last known good date. If that don't work, use the master restore CD / DVD (for the much newer models) to restore the system back to when it was first shipped to you. (YOU WILL LOSE YOUR DATA IF YOU DON'T BACK IT UP ESPICIALLY WITH THE LAST OPTION!!!!!!!). CMOS Batteries should be replaced every 3 - 5 years but don't generally go bad ever. CMOS Batteries help the BIOS remember all the information & settings. If the battery should go all it will do is forget Time / Date and User Settings and should not have immediate effects on system operation except the before mentioned items. (User Settings in BIOS).