I am using HP Pavilion DV6800us model since 2008. This Monday when I switch on the laptop power button, it surprised me with "Operating System Not Found" error message. From this point it is not moving further. I bought this laptop in the year 2008. I never had a problem before. Any help in restoring it back would be helpful to me. I contacted HP they told me the warranty ended already and they won't support Windows Vista right now.
Here is the information from BIOS:
Notebook Model: HP Pavilion dv6700 Notebook PC