I had a temperature warning come up on my iPhone 4 and now it won't turn on

I had a temperature warning come up on my iPhone 4 saying I needed to cool it to use it or something and turned it off and attempted to turn it back on as a means of fixing it, but it didn't work and now my phone isn't turning back on and even when I connect it to the charging cable (either to a plug socket or iTunes via my laptop) nothing happens; it doesn't even seem to detect it, my phone is still lifeless.
Anyone know what to do about this and how to fix my phone again? Cos right now, it's nothing more than a nice looking paper-weight. Would appreciate the feedback, thanks.

Try a hard reset while connected to power: (adapter, not iTunes on computer): Press and hold both the Home button and Sleep/wake button at the same time for about 15 seconds and release when the Apple Logo appears.
If this doesn't work: try to force restore: http://support.apple.com/kb/ht1808
NB: the article above will erase all data and content, so make sure you've got a backup
Good luck

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