MY FRIDGE MAGNETS ARE NOT FRIDGE MAGNETS ANYMORE

I used to stick those fridge magnets on where they should be, the fridge. However, when I got a new one (three years ago), I had stopped doing that. As fridge magnets would be something that people used to get me after coming back from holidays as souvenirs because they are cheaper and easy to carry, so I have these few in my collection. Not knowing where to put them, I opted for another spot: MY COMPUTER CPU casing.

My question is: will this in any way do any harm to my computer hardware? Or will this cause any data loss? IT experts, please answer.

I also have some key chains given by people. One of these days, I will get them posted in my blog.