My Latitude D610 power flicks on off on off The

touchfreeze Utility for Windows to disable touchpad automatically while...
If you are running Windows Touchfreeze is a little utility that freezes the touchpad when you are typing.
Download from the left side of the page

May be your headphone is not good, so let's check your headphone. If headphone is good, lets' install newest audio driver for your laptop to see whether the problem is fixed.

Check which all programs run in background?? maybe its due to high utilization of memory and cpu which results in freezing of this all??

have a look at ur keyboard,,,while holding the fn key press the appropriate function key,,these are the f keys across the top of ur keyboard,,look for the picture of ur keyboard or a padlock

On the bottom, labeled SERVICE TAG 7 digits, numbers and letters
also located in the system BIOS

i think either the port on which u connect to ur keyboard is not working properly.only solution is to go hardware shop.
if fdound useful plz vote

You could unlock it from, dell touchpad icon (you will find it beside the clock in the bottom right),after you open it you will find options for external mouse and such that, you will know your way for unlocking your touchpad.

Have you installed the touchpad driver?

the key circlled in yellow is the function key.

I guess this is teh one you are lookin for.

Have you tried System Restore? If not familiar... Start Button ---> Help ---> System Restore ---> "Restore my computer to an earlier date" --> choose an appropriate date, maybe a few days earlier than the problem.

Re-boot and see if works! If you are ceratin that the problem arose simply from hibernating, then restoring should do the trick!

Hope this helps!

-- RT

PS - Don't forget to vote!