My iPhone 3gs sudden turned off and after a few hard resets, and plugged in over night... still nothing. What else can I do?

The phone was not dropped or wet, but jut went off, it's charged all night and still after a few hard resets it will not switch on? is it dead?

Sounds like you need a new battery. My 3GS got the point of just turning off rather than shutting itself down properly so I knew due to the age of the phone it was the battery.
I got an ebay battery replacement for £12 + a set of tools for the job for about £4.
But please note relpacing the battery is not for the faint hearted!

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