The screen going blue and then appearing to turn off is perfectly normal. Try the following sequence to start your Piper software:
plug the screen into the power pack while leaving the pi unplugged. The screen will go blue and then appear to turn off.
now plug the pi into the power pack. You should see 4 raspberry pi logos and some text start to print to screen. This is the initial loading sequence and should launch you into piper after several seconds.