From what I’ve found when searching online, I’m not the only one who has their cursor periodically disappear in OSX Lion. Once in a while I’ll return to my Mac Mini (my iMac and Macbook Pro never have this problem) and my cursor is nowhere to be found. The mouse or trackpad still works; if you go way down on the screen over the dock the hover affect will work but the cursor is still not visible.
Zoom the Screen
One way I found to bring the cursor back is to zoom the screen. If you don’t already know this, you can zoom in the screen at any time by holding down the ctrl key and scrolling up (or down depending on your system preferences). You can then zoom back to normal again by doing the opposite and, voila! Your cursor is back.
I can’t guarantee that this will work for you but it definitely works for me and I’ve heard from many others who say the same. Hopefully this tip will help you end the frustration of the missing Lion cursor.
If you have another solution to this issue, please do let me know in the comments. I’m sure others would love to hear about it too. The above solution works but it still annoying.