Why won't my left mouse button always work on minecraft?

I don't know if this helps at all, but here is some information about my computer
1) It's an HP TouchSmart Pavilion
2) Minecraft is NOT on touchscreen mode
3) My computer is basically brand new, I've had it for only over a month

The button works sometimes but I end up dying a lot because I can't kill any monsters! It really aggravates me!

Amber

I have the same problem. Minecraft doesn't always recognize the mouse and makes it lag and/or irresponsive. No fix so far as i'm concerned

johnny