Has your son ever tried these mice? They are terrific, espeically the side buttons, flipping back through websites is nothing for me. My scroll bar is so fast even at 800 DPI...its unubelievable...and when I forget to put it in the charger...do I ever hate using the corded mouse until it recharges...everthing is just so easy even for mundane everyday web-browsing. As far as the dents in the MX518...that's where your fingers go and it allows a plyable left and right clicking, its like a mylar type of thing...he doesn't want any dents or lights? Low battery indicator is out? I wish that other MX1000 owner was still here...I've never make a mistake with the side buttons. In the beginning, I hit them a few times by mistake...its called learning, but not once in the last year and a half. Every time my cousin comes over here to play a game, and I tell him to left click ...he always clicks the wheel...he keeps looking for lines to tell him where right and left are. Then he gets used to the idea there are no visible left or right clicking lines, its the entire left or entire right side of the mouse whereever your fingers are comfortable. As far as the lights...they are LED lights and barely noticeable. That one poster said on the MX610 you can turn off the mail indicator ... they are like pinpricks of light...I forget to look at my battery indicators They are not that visible.. The Diamondback Plasma they are more visible...its an art thing and because they are LED they don't use much, if any, extra electricity. Why is your son insisting on archaic mice? Have you watched the little movie presentation? On the link below click on "Product Tour". You can turn features on or off with the software. The hardest thing to get used to is the size. They are larger, they require a bigger mouse pad, and lasers do better on flat light colored surfaces...but lasers will track fairly accurately on any surface. Are they ever sensitive to the slightest movement...but you get used to it...real quick. Instead of wide swings its a flick of your wrist. And believe it or not you even get used to holding the mouse without ever touching the buttons. The only drawback is the 2.4Ghz frequency and wireless routing...the one poster said even with that there was no interference with the mouse's performance...If you don't have a wireless router ...it might be a blast to learn with. New Technology. marf Here is a link that might be useful: MX610 Product Page

You are lucky you had it working for 2 years I got a logitech combo wireless mouse and keyboard for Christmas it worked ok for about 3 weeks then it just went wacky. Started typing random letters across the page and the mouse seemed to only work when it wanted to. I returned it. Went back to my plug in keyboard and my GE wireless optical mini mouse. Works great.

The SetPoint settings are stored in %userprofile%\Application Data\Logitech\SetPoint\user.xml Just close SetPoint from the system tray (so that it writes your settings to the file) and backup that file.

You probably need to push the reset button. That makes it look for the signal. Some have a little tab inside the battery compartment, with a divot you can push with a pen (though you can probably just use your finger). If there's a receiver, rather than just a little USB tab, there may also be a reset button on the receiver. If that isn't the issue, it may help to reboot so that the computer reinitializes with the mouse on. Trying a different slot was a good suggestion too, for forcing a reinitialization. Did you check the power level in the new batteries? Could it be low enough to turn on the lights but not run the mouse? Is there crud on the lens (optical) or ball (mechanical)? Did you check to see that the batteries are making good contact? I turn them in place sometimes to make it better. If all of that fails, check the manual. :) If you don't have it, check for a PDF on the Logitech site.