D300 dead - no power at all (with good battery).

HI I AM SAGHA FROM MUMBAI,BEING A CAMERA REPAIRER, FIRST MAKE ME CLEAR WHETHER YOU HAVE CONNECTED CAMERA TO YOUR DESKTOP OR LAPTOP IF TO THE DESK TOP THEN DUE TO LEAKAGE CURRENT OF THE SMPS (SWITCH MODE POWER SUPPLY) WHICH PASSED TO THE CAMERA CIRCUIT THROUGH USB PORT WHICH MIGHT HAVE FUSED OFF THE POWER CIRCUIT OF YOUR CAMERA BUT I THINK IT IS NOT SELFRECTIFIABLE PROBLEM. SO BETTER SHOW IT TO RECOGNISED REPAIRER OR SERVICE CENTER & GET IT REPAIRED.& DO NOT REPEAT THE MISTAKE AGAIN.USE SEPERATE CARD READER ONLY.OR IT COULD BE SHEERLY COINCIDENCE WHICH HAPPENED WITH YOU & MANY OTHER PEOPLE,WHICH IS THE BIGGEST DISADVANTAGE OF DIGITAL MEDIA IN WHICH END USER HAS VERY LITTLE TO DO IN CASE OF FAILURE.I AM VERY SORRY ABOUT YOUR HOLIDAYS.ANYWAY THIS TIME BUY SMALL CAMERA & ENJOY YOUR HOLIDAYS.ALSO KEEP IN MIND THAT YOUR CAMERA IS SURELY REPAIRABLE.DON'T BE NERVOUS.ALL THE BEST