Iphone turns on and turns off

i turn on m iphone 2g it is starting up then when it should let me slide to unlock it goes black (turns off) what should i do.

Hi,
Try resetting the iPhone by holding the Home and Sleep/Wake buttons until you see the Apple logo as described here: http://docs.info.apple.com/article.html?artnum=305743
If the issue persists, try updating and or restoring the iPhone as described here: http://support.apple.com/kb/HT1414
-Jason

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