Iphone 3G- my device wont turn on after the silver apple just goes straight off, HELP?

My phone is beside me, keep coming onto the logo automatically and just switching off. I always use my phone, I can not use it as it is doing this. I would appreciate to know what is wrong with it and also would gather information on how to fix this.

Has not been next to water.
been on charge all night- I have been doing this quite a lot but I have researched this and it has nothing to do with the battery.
I did not try to delete an App. It just turned off automatically.
Sorry my phone is not in the right category. It didn't have one for phones.
Asked Aug 08, 2013
Leave it to die of battery then Charge it
Answered Aug 08, 2013
Edited Aug 08, 2013

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