My 2004 prius will not start...no lights, no sounds, no nothing....and will not jump start...

I drove my prius to the store and when i came out i couldnt unlock the car...and i replaced the key fob last week...so i used the key to gain entry. Once inside i tried to start the car but i got nothing...no sounds no lights....nothing. Then i i tried to jump the car...and i was very careful to place the positive on the positive connector under the hood and the negative onto a metal part of the frame....the car still had nothing....so i let it sit on the charge for about ten minutes...still nothing. I unhooked the cables and did a visual inspection and realized that my positive cable was loose...so i secured it...but still nothing... I tried to jump it one more time...still nothing....please if you have any suggestions

 

An update...i took the battery in and it was at 13 v and came home.rehooked.the battery up....got a multimeter and tested the front jumper under the hood and it also read 13...now i am really stumped...the car still has no lights no noise and no start

 

Thanks for your help...actually i went through the fuse box yesterday and i did find a blown fuse for the dome....when i replaced iit the car started fine.....i really appreciate your time