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If the touchpad still isn't working, it is likely that there is a hardware failure and you need to contact lapair a trained professional to repair or replace
HP Pro book 840 G4 Track pad repair
Contact Details
LAPAIR
No. 838, 11th Cross, 1st Stage, 3rd Block, HBR Layout,
Bengaluru Karnataka 560043
080 25447708
[email protected]