Then you woke up this morning with the equivalent of a dead horse's severed head in your bed! Ohhh, look how they massacred my boy! Look what they did to my boy! (Yup, two Godfather references.)
Don't panic. To save the PlayStation Vita from the blinking blue light of death, hold the On/Off button located on the top of your Vita for about 30 seconds. Your Vita will boot into a debug menu where you can choose to start it up normally.
See? Good as new.