Sorry, just bought N900 2 weeks ago and I'm still new with this.

I have a problem with N900 camera app. I only could take 1-2 images then it stops responding (hang up at camera screen), I had to hit END CURRENT TASK to quit it.
Here are some things I found after it hung up:
1. When connect to USB port, it says "Device Storage In Use", cannot access to Mass Storage. Need to restart N900 then OK.
2. After quitting the app, when go back to CAMERA, the old taken screen is still there.

Even I formatted the Storage Drive on N900, the problem is still there.
Looks like I have problem with the back LEDs, it does not flash, but turn FlashLight on OK.
I just UN-installed Fcamera, BlessN900 and I have not used MicroSD card.

Would appreciate any help to analyze this issue...
Thanks so much.