Try a forced shutdown on your phone by holding the power button, if the phone still does not turn off remove the back and take out the battery.
If the problem still remains please let me know and I shall provide further assistance :-)
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== Update ==
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1 Press the "Alt," "Caps," and "Delete" keys at the same time. This will perform a soft reset of your BlackBerry. The BlackBerry device will reboot. If the frozen screen doesn't disappear, proceed to Step 2.
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2 Locate the "Reset" button on the back of the smartphone (the button may be under the battery cover or on the bottom).
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3 Press the button by using the tip of pin or paperclip. This will perform a hard reset of your phone. No data will be lost.
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4 Power on your BlackBerry device. The frozen screen should be fixed.
Try a forced shutdown on your phone by holding the power button, if the phone still does not turn off remove the back and take out the battery.
If the problem still remains please let me know and I shall provide further assistance :-)