When I try powering up my phone it stays on the logo screen for a few seconds then turn off, whats wrong with it?

When I try to power up my iphone 4 32g, it will stay on the apple screen for a few seconds then turn off. even when I try connecting it to my computer it turns on for a few seconds then turns off. Whats wrong with it? and what do I do about it?

Have you tried charging it with another known working USB sync cable?  After letting it sit to "charge" for at least 30 minutes, have you tried resetting the device by pressing and holding both the Select/Center and Menu buttons together long enough for the Apple logo to appear.
B-rock

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