keyboard is not working

@aman91818 connect a USB keyboard and see if that works well. NExt you want to check the keyboard connection on your motherboard. Make sure it is properly seated and that there is no corrosion etc. preset, If that checks out okay, you may just have a failed keyboard.

Download the service and maintenance guide for your computer from here Page 69 and on will tell you how to replace the keyboard as well as the part numbers for a replacement.

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