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HP Elitebook 2760p Win7 speaker muting and keyboard typing zxc\ty., automatically

Elitebook 2760p
Microsoft Windows 7 (64-bit)

Bought this week a refurbished 2007 era HP 2760p Elitebook Win7 convertible laptop with touchscreen.  Physical shape is as new, all components work.

Worked fine for 48 hours.  Downloaded updates since Win7 OS and drivers were installed on it in 2017.  

Now there is a problem that many others have had years ago on same model with same OS.

Speaker Mute or Unmute bar on bottom edge of display panel flashes up again and again, no matter what muting or unmuting is set, or even if the Audio Service is turned off instead of Automatic with delay is set in Services list.

The keys zxc\ty., are not responding (not sure if left Shift is included).  Every  other key is fine.  A USB keyboard works fine for all keys.

There is multiple automatic typing of just zxc\ty., and speaker bar flashes.

Any attempt to download a program from Internet gets interrupted and restarted again and again.  Any Avast or Windows Defender scans that start are interrupted and restarted again and again. 

Safe Mode avoids this keyboard and auto typing problem.

Searches of Google of zxc\ty., find many others with same, including those on this forum as recently as a month ago.  Suggestions range from replacing the internal keyboard, resetting the hard drive OS, editing the services list that is auto or manual or stopped, scanning for viruses, to running Linux.  All solutions are just temporary for various lengths of time, but never more than a few hours.  Any brilliant ideas?

† The opinions expressed above are the personal opinions of the authors, not of HP. By using this site, you accept the Terms of Use and Rules of Participation