Wow...I was seriously worried there for a minute about my Vita. It was also blank screen with solid blue light. Mine froze first, then when I went to turn it off....the menu with the "power off" function came up but then also froze on me. Holding the power button for 20 seconds, like you suggested, worked for me. Thanks so much for posting that!
Thank you so much. I thought i would have to take my sons birthday present back. It works again YEAH!!!!!