Motorola Triumph :: Permanently Stuck In Bootloader Mode

Upon turning on my Triumph, the phone states the phrase "Incoming Download Mode" once, then repeats the following message over and over, on a black screen: "polling, get oemsbl_mode = 1". Apparently this is the bootloader mode. I am Not inadvertently or intentionally holding down the volume down button or any other button at the same time as the power button, as many forums mention as the possible problem. I have tried: pulling the battery for hours; pulling the battery and holding down the power key for 30 seconds; pressing the volume up and down keys a lot when the phone is off and the battery out (in case up or down volume button is stuck), then powering up the phone. In none of the above scenarios is the phone connected to anything via USB cord. At the time my phone developed this problem about 48 hours ago, I was simply surfing the web on my phone.