My phone won't turn on/charge?

my motorola w315 was dead over the weekend because i left my charger at work. now that i've plugged it in though, it won't turn on. instead of saying battery charging on the external display like it usually does, it just lights up, then goes out, then lights up again, etc. when i open the phone the screen just displays the motorola powering on logo. i tried taking out the battery and putting it back in, but it's still doing the same thing. i've had it plugged in for over an hour now and it still won't turn on. (it would usually be able to turn on immediately when i plugged it in.) i tried holding down the power button for a while too, but that didn't do anything.

(the phone is only a few months old and serviced through alltel, which unfortunately doesn't have a store here in chicago where i could take it to. i usually charge it every other night, and don't make many calls on it, but it goes dead quickly because i'm always semi-roaming...)