htc sensation vibrate but no boot

[tomjbirch]

my 2 month old sensation will not power up after having the digi replaced, all the connectors are in place and it is fully put back together but now it will not display anything when you press the power button it just vibrates. i took the battery out and then put it back in then plugged in the usb and get the backlight on for afew seconds but then that went off aswell.