That's a very strange message "Operation system not found" in your picture in the post on dell.com. Because it's bad English (it's "operating system"). I can't imagine Dell makes PC's with such a message in the BIOS.
Anyway, it seems you have yet to install an OS on the new hard disk. If it doesn't boot from your DVD-drive, try installing it from a USB-stick or an external optical drive. Or - much simpler - clone the old hard disk to the new one, if the old one still works.