HTC problem

[kebteach]

Powered off my HTC sensation and when I tried it again the screen came up with this:
*****Locked*****
Pyramid Put Ship S-on RL
HBOOT-1.18.0000
eMMC-boot
Aug 2, 2011.22:35:52
HBOOT

<vol up> to previous item
<vol down> to next item
<power> to select item

FASTBOOT
RECOVERY
FACTORY RESET
SIMLOCK
IMAGE CRC

I went to the tmobile store and they were no help what so ever. When I plug the phone into the computer using the USB cable, nothing happens. It does not read it. Please help. I have text messages on this phone that are very special and I would love to have the opportunity to save them! Thanks in advance for any help! Karen