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Perform a hard reset on the BlackBerry smartphone. To perform a hard reset, complete the following steps: 1) Remove the battery cover from the back of the BlackBerry smartphone. 2) Remove the battery, and then reinsert it after a few seconds. 3) Replace the battery cover. If the display is still not working, verify that the battery is charged by trying it in a different BlackBerry smartphone. If the battery is working, download the latest BlackBerry Device Software and install it using the application loader tool in BlackBerry Desktop Manager.
This might be because of Hardware issue you need to walk into the service center to get it repair.
For your track ball:-
1) Go to menu
2) Select Option's
3) Select screen and key board
4) Make Horizantal and vertical sensitivity to 100, Still not working you need to walk into the service center.
Remove the battery, then remove the Memory card and Sim card (if you have a sim card). Then replace battery. Try this. If this does not work, while off try connecting the device to your pc, through bb desktop software. If the device STILL does not turn on or your pc does not recognize it, you may have a hardware problem.
Assuming you have an 8100 pearl I believe for some reason this phone does not do mms. either that or the following is true.
With certain wireless providers a BB data plan may be required for MMS
to function. For example, T-Mobile has a $0.00 feature that can be
added to a persons account to enable MMS (which is included in
messaging packages) without enabling full data capabilities. I believe
Alltel offers a similiar feature. Contrastingly, ATT BB's cannot send
or receive MMS without the $30, minimum, BB data feature being on the
account. I'm waiting for a class action suit against ATT for taking
subscribers money for messaging packages, that include picture
messaging, but not providing all of the services being paid for by some
PDA phone users.
I have had this problem for about 8 months. I have tried everything and nothing works. I accidently found out a fix:
It appears the problem of my Pearl was the bad connection of the camera. When I start the camera, if I squeeze the phone body hard around camera area to make a better connection, the camera works right away. This works for me 100%. I hope you have the same luck.