If you think your phone may be bricked and wont turn on, try a soft reset (possibly followed by a hard reset)
1. Take out the battery, then press and hold the ON button for about 10 seconds or so. Replace the battery, then press ON button to try to switch on. This is a soft reset, and wipes the temporary memory and empties all remaining power in the circuits.
2. If this does not work, do as above but after inserting the battery, press and hold the ON+HOME buttons at the same time for 10 seconds or so again. This is a hard reset, and works best if done after a soft reset, so always try the soft reset first.