I've got an iPhone 4 and the lock (power) button and the home button doesn't work. My phone won't turn on and I've tried plugging it in to a power source but it still hasn't done anything. Can anyone help me?
If an iPhone is off, and you connect it to a power source (either a charger or computer), it will always turn on. !!!
If that is not working then something more serious is going on. Bring it in for repair.
Just in case it is locked-up, try holding the Home button for 30 seconds, but that might be a fruitless exercise.