I have just been tidying up my friends acer laptop after a repair to power connector on motherboard. have used ccleaner and glary utilities, but i have noticed there is no sound at all either at start up or playing cd's its a vista home basic pc, it has a digital output device (spdif) and is showing as working, dont no if sound was working before I played with it and cant contact them, have checked all mute buttons and all are ok, am I missing something many thanks
Erm... you do really need to check with the owner if it was OK. Being an Acer you should be able to reinstall the whole operating system (so it's all as it was on day one) but you'd lose any personal stuff of course and anything that had been put on since. If it was working before maybe try a system restore back to a known good date. Again being an Acer there may be the option in ERecovery to reload any drivers so might be worth uninstalling and reinstalling. Type "Acer" into the search or run box and a PDF copy of the user manual should hopefully come up. That gives the instructions for using the recovery partition.
Also worth running a file system check, click start orb click computer Right click "Acer C" Select properties Click tools Select "Check the volume for errors", put a tick in both boxes, close any applications and do a restart. Takes around 45 to 60 minutes.
If that's OK at a later time run from a command prompt sfc /SCANNOW note the spaces to check for any incorrect Windows files.