[Elecraft] Need Help with my K2 did not turn on

[Mauricio Fernandez via Elecraft]

Hello

I'm just new in the Elecraft world.  Recently I purchase in Ebay a K2 Serial 4401.  The problem is that when I connect the radio to the power and press the switch button it turn on but immediately turns off,  it shows the word elecraft, it reads the frequency and when goes to the power display PO and then and then goes off. 

Thank you for your help 
KP4LE
73's