This is my first post and first problem in Nokia N900.

I switched off my N900 and switched it on again and It hung up with five dots after booting up. When I remove sim card and try to start with only battery and it works right. when I insert sim card and try to switch it on, only dots appear and shows some process running behind. I tried this things :

* Deleted contacts from the sim card
* Enabled R&D mode and switched on. same issue. booting up and dots.
* Switched off mobile and taken out battery and connected with usb and then switched it on and inserted battery.
* Removed battery and tried to switch on without battery to drain out any charge.
* Tried sim card on other mobile and sim works right.
* Inserted different sim card on N900 and switched it on. same problem.
* Battery is almost fully charged (~80%)

Mobile works ok without sim card. So I can say now my Nokia N900 is only computer and not computer - phone...!!!

Has anyone experienced similar problem?