Plug it into the pc and make all the contains back up. Then remove the memory from the phone and try one of the following.
Soft Reset
will clear pending errors and bring your mobile to an initial state by restoring Factory setting. To operate this function on your mobile, the shortcut is:
*#7380#
Hard reset
- Enter the code: *#7370# and press Yes to confirm initialization.
- Important Notice: It is recommended that you save all important information on your phone (e.g: memo, contacts etc)
- To make a Hard Reset on a Nokia phone that is not willing to turn on, just press simultaneously these 3 buttons:
- on/off + * + 3
Then restore the back up.