Here I am again .. my BlackBerry 9000 came up with the “White screen of the death” and message App error 200. I have tried to connect my BlackBerry 9000 over USB cable to my pc and reload the OS as I did last time when I received the same error message. However, this time it was very different. I could connect the device with PC but I could not load the software to the device at all. It always failed. I was on the edge that on Monday morning .. first thing will be calling the manufacture support and get RMA for my phone. I just got simple idea in the process of trying to figure out and I have removed my SIM card — wow .. the phone boots up and loads all software no problem. So I have re-inserted my SIM into phone === App error 200appears .. It seems that the phone is OK and my SIM card seems to be the culprit and problem. I will need to visit my provider and get a new SIM card for phone 
- Remove the SIM
- Boot up and one in the normal operational mode
- Security erased my BlackBerry
- Inserted my SIM and boot the phoen up
- Resyc with my desktop
- All works .. seems to me that one of the 3rd party applications on the phone will have something to do with this problem.