Laptop keyboard not working even after replacing it.

Dell Laptop keyboard is not working. I can type only a few letters on the right side of the keyboard. I plugged in a USB keyboard and it works just fine. I ordered and changed the internal keyboard and that one does not work at all. I tried the removing the battery and power trick and that did not work. I also uninstalled the driver and reinstalled etc. Windows 10... any ideas?

Update: on the new keyboard only 3 numbers on the number pad are working.
cnl83Asked:
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Tony JohncockLead Technical ArchitectCommented:
If you boot to a Windows install disk does the keyboard work?

From what you describe either the connector or the motherboard is faulty.

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cnl83Author Commented:
The keyboard does not work in bios either. I think it is the mobo.
cnl83Author Commented:
Update: on the new keyboard only 3 numbers on the number pad are working.
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JohnBusiness Consultant (Owner)Commented:
Could be the motherboard.  Also could be the cable or a faulty connector

You probably need to get the machine serviced to determine the exact cause.
Tony JohncockLead Technical ArchitectCommented:
Could be the motherboard.  Also could be the cable or a faulty connector

Unlikely to be the cable as they ship with Dell keyboards.

Other than that you echoed exactly what I already said. :)
☠ MASQ ☠Commented:
Any idea what the original cause was? This is typical of fluid ingress where the keyboard damage results in electrical damage upstream in the motherboard.
cnl83Author Commented:
No idea what the original case was. I does the same thing in Windows repair / command prompt.
JohnBusiness Consultant (Owner)Commented:
So it is a hardware issue and need service
nobusCommented:
did you try cleaning the cable contacts?  also inspect ( as well as you can)  the connector
web_trackerComputer Service TechnicianCommented:
If a replacement laptop keyboard connector cable was seated properly into the connector on the mobo is not working then the problem definitely lies in the motherboard. It is definitely not a windows issue since it does not work properly in the bios either and a usb external keyboard works fine. I doubt it would be a faulty keyboard replacement since both the original and the replacement keyboard have the same issues. I agree with MSQ the problem is with the motherboard. If the system is out of warranty and the user does not mind using a external keyboard then go that route. Otherwise replace the laptop as the replacing the mobo can be as expensive is buying a new laptop, unless you replace it yourself.
nobusCommented:
he did not say the new KBD had the same problem- he said it did not work at all
Tony JohncockLead Technical ArchitectCommented:
I agree with MSQ the problem is with the motherboard.

I think you'll find that it was me that first said that. In the very first response to the OP.

The likelihood of two keyboards being faulty is slim but not impossible. Since laptop keyboards ship with the ribbon cable as part of them, it rules out the cable as well.

If you've checked the connector / given it a clean, and the fact that you see issues outside of the OS, but not with an external keyboard, then I stand my initial assessment that this is most likely the motherboard at fault.
nobusCommented:
i expect, if the mobo is the problem, that the new one should haver the same problem; however he posted it did not work at all
☠ MASQ ☠Commented:
The replacement keyboard does work, but not fully, and sounds like different keys respond:
"Update: on the new keyboard only 3 numbers on the number pad are working."

BTW wasn't trying to grab credit here from Tony, just wanted to add some background to a likely cause given what's described.
nobusCommented:
cni83 why don't you jump in and clear this up ?
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