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Laptop keyboard stopped working Win7


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#1 scottm704

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Posted 03 November 2016 - 02:57 AM

First time poster at the end of my rope with this issue. I recently upgraded my laptop CPU. I used a processor that Dell had tested on my specific model of laptop (N5050) and everything was fine for about 2 weeks. I used ESD protection and didn't do much actual touching of the motherboard. About a week ago the laptop did a hard shut down for no apparent reason. There was no BSOD and when my system booted it didn't prompt me to go into safe mode. However once I got to the Windows profile screen the keyboard was not responding. The HD is new, the system is about 5 and a half years old.

 

The keyboard works fine through POST, Windows sees it and is not displaying any errors in device manager. I got the keyboard working again by rolling back Windows to just after I installed the new CPU. However, when I let Windows update run tonight the keyboard stopped working again. I rolled Windows back and it is still not working. I have un/reinstalled the driver as well as trying several restore points. The ribbon is firmly in the port. The keyboard is still working through POST and in BIOS but as soon as the OS begins to load it is no longer active even though device manager shows it is active. My anti-virus is not finding anything and I don't use the laptop for anything that is risky for malware (no porn, torrents, opening strange e-mail attachments, etc.).

 

Any ideas what to try next? I really don't want to reinstall the OS.

 

Thanks


Edited by scottm704, 03 November 2016 - 03:09 AM.


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#2 JohnC_21

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Posted 04 November 2016 - 05:55 PM

Try the following. Open regedit and navigate to the following key. You will need to use the onscreen keyboard for input.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\i8042prt

 

Under the Start subkey change the RegDword value to 1. Restart.

 

Make sure i8042prt.sys and kbdclass.sys are located in C:\Windows\System32\drivers

 

The video is for Windows 10 and 8 but same procedure holds for 7.

https://www.youtube.com/watch?v=hXKx9Ew1pww


#3 scottm704

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Posted 08 November 2016 - 07:36 PM

Thanks, worked perfectly!



#4 JohnC_21

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Posted 09 November 2016 - 03:27 PM

Your Welcome,

Thanks for the update.






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