Left click stopped working all of the sudden. Help?

Earlier today, my MacBook Pro's trackpad button was working just fine. Now it's not. Whenver I press it, nothing happens. I can still move the cursor without a problem. I connected my Mighty Mouse to my MB Pro and everything in my MM works fine, except for the left click. Then I decided to shutdown my MB Pro and reboot it, hoping that it would get rid of the problem. After it turned back on, I realized that the left click is still not working, both on the trackpad and my MM. I even reseted my PRAM and that didn't fix my left click problem at all.
How do I get the left click working again on BOTH my trackpad and my MM?
Here are the specs for my MB Pro:
- MacBook Pro with 15 inch screen (Late 2006)
- 2.16 GHz Intel Core 2 Duo Processor
- Running on the latest version of Lion (10.7.5)
- 3 GB of RAM installed

I have this problem too! I just posted a question - how did you fix it or did it just go away? Mine computer is unuseable. Left click does some things but not all.
Here's my post
I can open MAIL but the MAIL menu doesn't appear at the top, and the LEFT click doesn't work properly, but right click does work! Command Q doesn't close the program, it's like it's half open. I can get rid of the page with the LEFT clicker (red button) and I can sort of select stuff in an email but it's grey. The buttons along the top work (Get mail, new message etc), but if I open a new message I can't do anything with it, there's no cursor.
Other programs the same (like Excel)
I restarted with the buton on the back, it'll work ok for a few minutes then not so ok. I managed to copy some files onto a hard disc and that all worked fine.
It seems to be all in the communication between the mouse/keyboard and the computer. Yes I have tried a wired mouse and keyboard, with the bluetooth one off, no help, same result.
This is not a result of new installation. There's no half-dead mouse hiding somewhere.
Help! Thanks

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