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Keyboard Issues, LEFT SHIFT + LEFT CTRL + L/R ARROW doesn't work on travelmate P645-S windows10

Recently i am facing issues with my laptop. Key combinations doesn't work especially with SHIFT. 
List of combinations (Not working) :
LEFT SHIFT + LEFT CTRL + LEFT ARROW
LEFT SHIFT + LEFT CTRL + RIGHT ARROW
LEFT SHIFT + LEFT CTRL + UP ARROW
LEFT SHIFT + LEFT CTRL + DOWN ARROW
RIGHT SHIFT + RIGHT CTRL + RIGHT ARROW

List of combinations (Working) :
RIGHT SHIFT + RIGHT CTRL + RIGHT ARROW
CTRL + C, CTRL + V, CTRL + X
Other than above 'working' combinations no other combination works with CTRL and SHIFT
Please let me know why this issue is occurring!
Is this a hardware issue/ software issue?
i have updated keyboard drivers, also uninstalled and restarted laptop & let drivers install automatically.
Also i have checked if laptop's keyboard is loose or anything... everything is fine on that side.

P.S.
Recently i have upgraded my 4+4 GB RAM to 4+8 GB RAM
this RAM is DDR3 and may not be original :P 

Any help is appreciated.

FAQ & Answers

  • yogprabhuyogprabhu Posts: 2Member New User
    seems like a keyboard hardware issue
  • JackEJackE Posts: 17,093ACE Trailblazer
    Open ControlPanel. Search 'restore point'. Click 'create a restore point' in the left pane. Click 'system restore' button. Click 'next'. Do you see a restore point listed with a date stamp that approximately coincides with when you first noticed the KB issues? Jack E/NJ
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