might be a failing hard drive well first try this 1.turn your computer on 2.Insert your installation disk i believe is leopard mac os x 3. turn off your computer 4.turn on the computer and quickly hold x dont let go until you see the installation disk 5.continue with the settings 6. this is just to install any missing files 7. goodluck
Step 1. Reset All Settings (Quote This Wont Erase Your Stuff Just Settings) Step 2. Replace Your Battery If Step One Didnt Work? Step 3. If step 1 and 2 didnt work try backing up your data and restore Step 4. if that didnt work your phone is defective.