Left click does not work. Both on touchpad and external mouse.

SOURCE: Touchpad Problem

oh you cannot navigate using Touchpad you can use "tab" key. if doesnt work also shut the computer by holding the power button about 5 seconds and restart the computer. If issue persist please post your question with model information of the computer, Operating system etc.

Good Luck
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SOURCE: left click for mouse does not respond - right click very slow

Hey, pufpuf!
It's kind of hard to tell without actually looking at it,but
as skotkoir sez, replacing it with a good used on is probably the better way to go. Sounds like you have one of two problems. Either there is something (foreign objects, food, soft drink residue) that is binding up the buttons and/or making them sticky; or something has broken in the assembly. Not much that you can fix.

SOURCE: acer aspire 5620 touchpad problems

Go to acer website and look for support/then driver download/select your model/and download/do RUN instead of SAVE

SOURCE: Left click not working HP Pavillion Alps touchpad

The left click button gets the most wear and tear on the palmrest. If out of warranty, you have a couple options.

1. Replace the palmrest assy
2. Use a mouse

SOURCE: Touchpad has no tap, left key not working.

Hi there,
I had this issue and resolved it by doing the following:
-Open the start menu by using the windows button
-Use the arrow keys to highlight run and press enter
-Type 'control panel' and press enter, find the mouse properties and enter
-From the buttons tab in mouse properties, go to double click speed and change to slow and confirm the changes
-At this point it probably still wont work, so do the above again but change the double click settings to fast and confirm.
-Restart your PC and this should resolve the matter. you can alter the double click speed again if you wish :)

Hope this helps,
tbo