Sounds like he did the OS reset some have built into machine. Make sure the BIOS points to your HDD and pull out pen drive and any CD in tray and try to boot the system.
Did you reset the BIOS?? What do u mean by Factory reset?? AFAIK there's no factory reset in a laptop apart from the BIOS. Give complete details of what you've done. Regarding the error your getting, just points to one thing , you don't have an operating system installed in your system or probably you've lost an operating system due to something that you have done.
Sounds like he did the OS reset some have built into machine. Make sure the BIOS points to your HDD and pull out pen drive and any CD in tray and try to boot the system.