knowing the word corrosion should answer your question yourself
http://en.wikipedia.org/wiki/Corrosion

You can get a new N900 on Amazon for just $349

i dont need no phones , i have two n900s

I had a similar problem with the touchscreen, it was getting more and more "jumpy" (i.e. when touching certain areas the image was "vibrating" instead of registering a click), scrolling was only half working, click would sometimes register in the wrong places etc. Some days were better than others, but overall things were degrading fast.

I came across this thread and took the advice of removing the screen protection film (mind you, one of the expensive 15 Euros kinds, worked very well for half a year).

It worked, but now my question is: if I put it back on, after cleaning it, will the problems come back? Has anyone tried? It's going to be a hassle to clean it up properly and re-apply it, it would be a shame to then discover that the problems are then back again.

To be honest, I get problems with screen protectors alot. I clean the screen, make sure there is no dust and that it is completely clean, then apply. It is then ok. Then all of a sudden, one day, the screen will play up, even though there is nothing under the protector. Because of this, I buy cheap ones from ebay - a twelve pack for about £3 - then when it plays up, just replace it again. But I don't know why sometimes it's ok for ages, and others, it plays up sooner. Weird. I have had three n900's, and they all act the same. It may be because the screen protectors are so cheap, but I don't want to pay for something like a Zagg protector, just for it to go wrong after a few days/weeks or whatever. To be honest, you will probably struggle to get a used one clean enough to put back on without any problems, but it's worth atry.

Wow, just thought my N900 had failed me. Used it in the morning, and put it it in my pocket as usual. Pulled it out 2-3 hours later and my touchscreen was acting really weird. Well, time for a reboot anyway i thought. But back at the lockscreen i noticed that the reboot hadn't fixed it.
It seemed like someone was pressing 3 all the time, even when i did not touch anything. I had a really hard time typing in the lock code and the pin. And after booting up completely it ran straight into the desktop setup thing and messed up all my icons. I still managed to get into screen calibration somehow and ran it, but that did not help ether.

After reading through this thread i gave removing the screen protector (zagg invisible shield) a try. I had this on over a year now and it worked flawlessly all the time. But i was kind of desperate and after removing it everything is fine again.

And the colors are better. I think i will stay without a protector now, since the device is over a year old, and is not treated too rough by me.

I still would like to know what caused it though. Static electricity on the protector or what? I don't get it...

im pretty sure the same thing has happened to me, i cant get into it because i have a lock code on it but the touch screen isnt working and i cant unlock it :/

i also had the same problem, my touch screen doesnt work. sent it for repair. when i got it back it work fine about 2/3 hours and again i got the same problem. after reading these posts i removed my protective film also. but nothing happened. it does'n work anymore. but this i can tell for sure. this is my final NOKIA!!!

I just faced similar problem as many of you have described in this thread which is screen acting weird double touches out of control sporiadically etc.

HOW TO FIX THE SCREEN PROBLEM!

well after successfully fixing it second time now i know that its the screen protector which is causing the problem dont know why but to fix this problem all you need to do is remove the screen protector clean the screen and reapply the screen protector again thats it! Hopefully that should solve the touch screen problems.

Enjoy the genious N900 again!

Hi all,

Sadly, I have the same problem as you guys.

For me, screen protector is not a problem at all. It is a circuit *connection* problem I guess. Because if I bend the screen a bit, everything is back to normal. My boys and I had dropped this n900 several times. Maybe that is the root cause.

Whew....