IPhone 4 keeps restarting, I'm desperate for

I have a black iPhone 4. I put it on charge a few weeks ago and ever since, its not working. It comes up with the lock screen like normal (hence I can still access the torch, airplane mode ect) but then as soon as I put my passcode in, it shows my wallpaper for a couple of seconds then restarts itself. I have tried to restore it but I can't allow access to iTunes because I can't get off the lock screen to allow it. I have very valuable pictures on this phone of my son and our recent holiday.

1. Please make sure that the power button works. If it does not please seek help from a phone store/apple.
2. Make sure that the phone was not in contact with water by checking the phone's LCI. On the iPhone 4, it is in the same opening where the charger enters. It is a small red mark visible. If you see it please seek help immediately to prevent any more water damage.
3. Place the phone in recovery mode by turning off the phone. Connect the phone to the computer and as soon as you do it hold down the power button until iTunes recognizes it. If it does, please restore the phone, you may lose all your data. If it doesn't please seek assistance.

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