Magic Mouse won't turn on AT ALL.

I found a fix! Take some aluminum foil and make two squares. Put each piece of foil between the battery and the negative side of the battery compartment. Make sure that each piece of foil does not touch, or you'll complete the circuit! If you've done it right, you should see the green light turn on. If not, leave it how it is for a bit and then check to see if the batteries are warm. If so, make sure the two pieces of foil aren't touching. If the batteries are not warm, try getting some fresh batteries. I hope this helps! If you need further help, feel free to let me know! I've fixed tons of these.

I appreciate what you are saying but this is not how your mouse should behave. I suspect you are using sub standard batteries, either dime a dozen sale items or unbranded. Quality batteries should not need padding. If they do, and the mouse/ keyboard is less than twelve months old, return it for exchange.

I am using Duracell batteries, so I'm pretty sure they're considered quality batteries. Whatever the case, the solution worked for me and hopefully it will work for others until they can find batteries that fit the compartment (I haven't had any problems with Energizers, however I don't have any of those.)

Yes they are considered quality batteries and that underlines what I said. This is not how an Apple mouse should behave and it should have been exchanged from the moment it became a nuisance, always subject the guarantee period. Stuffing tin foil in the compartment may give temporary relief but it is not a reliable long term solution. I guess one could argue all night about the length of a guarantee but most mice, and I mean most, do not have this problem. So replace it and be happy; it doesn't cost a fortune.

If I could replace it I would, but I can't afford it right now. I like my current mouse, and if it works it works. My posted solution was only for the people who don't have the liberty or the money to go out and buy a new mouse for $69.

So glad to read the comments here. I've replaced the batteries on my mouse several times and had not run into this problem before. After trying a second set of fresh batteries, it's working again. I do love this little mouse.

These fixes were great if the Mouse was Made in China $5 stuff. My MBP's trackpad does not work rightly. I purchased a cheap wired mouse to get rid of the headache. Working flawless matters.

Open springs at negative poles keep the battery in right position inside the other stuffs. The spring with metal cap fails to keep a good contact. Batteries slightly vary in length.

Thats why cleaning the cleaning the contact surfaces, package of aluminum foil - all works. It increases the chance of surface area of contact.

Captfred you are partially correct, customers give me magic mice and many I purchase are DOA.

98 percent of the time there is nothing wrong except for the Positive diameter of the battery.

Duracell and rechargeables are the worst they both have huge nipples on the positive end of the battery which doesn't allow the battery to seat fully (and make the connection) in the relatively small positive nipple hole on the mouse. Hence no power no green light.

Look at diameter of Rayovac + vs diameter of Duracell a huge difference.

Enjoy my little secret, Mac since 89. 😉

I tried the cleaning of all contact surfaces, the pounding of the little beast, the addition of paper to press on the batteries...nothing worked.
I finally filed on the ends of the two AA batteries and Shazzam, little green light comes on.
Note: I also used Lightbulb grease which is a silicone conducting paste. It didn't help until I filed on the battery contact surfaces.

Oh my gosh! I found this post to be so hilarious! My magic mouse was not turning on as well so I put in semi-new batteries from a toy sent from my ex haha and it happened to be Energizer batteries. My magic mouse did not like that at all! So I switched back to Duracell and it turned on right away!! So ironically funny!

Hi folks, dead mouse and i noticed a bit of that white corrosion(the enemy) around and on the left negative. But success cleaning all contacts with Isopropyl alcohol... Extra used on left spring loaded negative contact. I had been naughty recharging normal batteries and won't do that again... Very lucky.

Wow, this is interesting. I had the same problem, applied vermonter's fix, and my magic mouse works again! Something our beloved apple boffins should look at, methinks.