Is your phone rooted? You can try these step to see if you can get it working:
Try this:
Recovery IMG:
http://api.viglink.com/api/click?fo...rs&txt= here&jsonp=vglnk_jsonp_13251045745723
My Phone Died and i can't turn it back on!!! help!!
1. Download the recovery i have posted above. Once downloaded rename to remove the name of the recovery until its just named recovery.img.
2. Plug your device to a computer and run the command
adb reboot
or
adb reboot bootloader
if your device doesn't turn on, then simply pull the battery, put it back in, then redo the steps.
3. Once your phone does power on from one of those commands, reboot into android OS and put the recovery on the root of your sdcard.
4.Boot into bootloader while plugged into the computer and run the following command
fastboot flash recovery recovery.img
Then the problem is fixed! I'm very sorry for the inconvenience, but thats the fix.
Take from this thread on XDA:
HTC Sensation General FAQ's. New to this device? Read here! UPDATED 8/3/11 - xda-developers