My Droid X is locked up.

Yesterday, my phone was working fine. All day, no problems. Then, in the afternoon, I was loading a picture comment from fb, and after the pic loaded, the back & home buttons wouldn't work. I turned it off & on, and got the Motorola logo. I've taken the battery out & put it back in half a dozen times, with no change. I plugged it in overnight (no idea what else to do at this point), this morning it wouldn't even turn on. I used a tip from someone else to hold down power & volume, and it eventually started flashing a dos screen that said "battery low, cannot reboot". Now it's back to the logo. The manual buttons at the bottom do nothing. Any ideas?

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