reboot looping

[nntb]

so i killed the battery dead i guess by leaving it not pluged in over night... i woke up to the sound of a buzz then a while later another buzz at 6 am >.< my phone was rebooting its self for no reasion. i have no idea whats going on... is it because of a low battery? when i try and just leave it pluged into my ps3s usb(because i cant find the power adapter) it is just rebooting forever T_T

it does as follows

red light on
BUZZZZT
HTC Touch Pro 2 logo
Mighty Rom logo
black with red light on
BUZZT
HTC Touch pro 2 logo
.... ect

i was messing with it and got it to show the windows screen is this a result of a really dead battery?