Lenovo Thinkpad T420 trackpad and touchpad right/left click stopped working

So I have had a very... VERY... irritating problem with my Thinkpad.
For the first 6 or so months I had the laptop it worked fine. Then, the left click on the touchpad was functioning like the right click (bringing up a menu).
I immediately disabled the touchpad and then used the trackpad right and left clicks which worked perfectly.
After another 4 or 5 months, those buttons stopped working altogether. I could still use the touchpad to move the arrow, but I couldn't click on anything.
I bought an external USB mouse and that worked fine for another 2 months. Then for a few weeks, it would work on and off. I'd have to wiggle it around in the USB ports to get the laptop to recognize it. (it had nothing to do with the ports... there were 3 of them and they all worked fine).
Then it stopped working completely, AND, my laptop refuses to acknowledge ANY USB I plug in.
I have run out of options now. I can't even install anything, download any files from lenovo website. I can't do anything. Does anyone know if it is still salvageable? Has anyone had the same problem?
The lenovo digitizer for tablets.... would that work for this thinkpad? (sorry... not as tech savvy as the rest of you)
Thanks a bunch,
Amanda

Here was my solution to this. My left click button on both the trackpad and touch pad suddenly stopped working on me. After putting up with this for a few weeks I decided to investigate. I found if I disabled the touch pad the trackpad left click would start to work again. So I investigated by carefully popping off the left click button for touchpad. Everything looked normal, so I investigated a little father buy removing the small round blueish rubber piece in the middle of the button. Once I did this I realized it quite dirty, with a soft cloth and a toothpick I cleaned both the contacts on the PC and the the black spot on the rubber piece, putting everything back together and my left click worked once again.
The cause of my problem was just a build up of dirt under the rubber contact which caused the button to short out and disable itself.
I didn't have to reinstall any software or drivers.

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Here was my solution to this. My left click button on both the trackpad and touch pad suddenly stopped working on me. After putting up with this for a few weeks I decided to investigate. I found if I disabled the touch pad the trackpad left click would start to work again. So I investigated by carefully popping off the left click button for touchpad. Everything looked normal, so I investigated a little father buy removing the small round blueish rubber piece in the middle of the button. Once I did this I realized it quite dirty, with a soft cloth and a toothpick I cleaned both the contacts on the PC and the the black spot on the rubber piece, putting everything back together and my left click worked once again.
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Are the lights on above the touchpad.???
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MY BAD.
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Lenovo Thinkpad T420 trackpad and touchpad right/left click stopped working

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