No Green led

Hi, Was about to start the x-carve up today and diden´t get any connection to easel/computer.
Noticed that the green led on the g-sheild diden´t light. (The blue led lighted fine.) Checked the g-sheild to arduino and couldent find any problem with it and it also was on it right place. Is it anything that i have missed, what could i check for more? what part do i need to buy if i doesen´t get it to start? It worked well last time i used it.

Thanks for answering// Aron