Sony vaio won't boot up
Hi, this is my first post
I have a Sony vaio vgn-fw140e that worked pretty well until yesterday. I had Ubuntu installed on it and then decided I didn't want it, so I went to control panel>programs and features, and I uninstalled Ubuntu from there. Then I was planning to upgrade to windows 8, so I turned off my system. When I restarted it, it said errrr grub rescue. So I replaced the HD and rebooted it with an installation DVD in the computer. But the computer wouldn't boot from it, and now I'm stuck on the "no operating system found" screen. And yes, I changed the first boot priority to the optical drive in bios. Can anyone help me?