I installed new applications on my new N6600 - now it wont start up.
It stays at the white screen with the Nokia printet in the botton.
I tried without MMC and sim without luck.
Also pressing the green button + * + 3 - no luck.
Please help me - what do I do.

Take it to the nearest Nokia Service Centre.

Installing too many apps at the same time without restart can have adverse effects on your phone!
If you installed on Mc,remove it and turn on phone.
If you installed on phone mem do as above!