Dell Inspiron 1750 Keyboard problems

I have a Dell Inspiron 1750 Laptop, recently certain keys on my keyboard started not working the b,n,? the 1 and down arrow keys, so I thought it was the keyboard and ordered a new one and changed it well I still have the same keys not working. I also reinstalled the keyboard drivers. and when I plug in a usb keyboard everything works fine. CAN ANYONE HELP ME PLEASE 

0 Kudos