When i start my laptopt pavilion HP, it dose go to a blank page and whe i use try to find prolem, it sayes that your windows was damege, you need your windows CD for repaair it... whe i use F11 to recovey it ,it can not possible. whan want to instal a new windows, it can not fine any hard drive. when i take hp diagonstic, it say that yoy hard drive passed ok, .. when i call to HP center for service thay say that you need your recovery CD for repair that,.. so, I have not recovery CD ... therfore what should be do?