HELP HTC Evo 4g not charging?!

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http://androidforums.com – So, my power button does not work, only on really rare occasions, so I downloaded the "no lock" app so my volume rockers can turn my phone display on. Today my phone died, and I left it on the charger for 3 hours. I came back and it still wouldnt turn on. (usually if i plug my phone into the charger, my phone just turns without me having to press the power or volume rockers) Although it is not turning it, when I first plug it in, the HTC Evo 4g logo comes on, then dies. I THINK my phone just isnt charging the battery? but how could that be if i plug in the charger and the p (General)