5 days ago, I was downloading some file from internet and left my computer on. When I came back my computer restarted with a message like "no boot device found" I tried restart the computer several times and at the end it successfully entered into the windows. I start taking backup of my data and when the backup was 30% completed, my hard drive stop spinning. And after that I came to know that my drive is dead. And I lost rest of my very expensive data.
Then I bought a new WD 1TB SATA2 hard drive and started using it. Now again some times I am receiving the same boot failure message "no boot device found" and when I restart my computer, it works fine. I am really afraid about it again, because I don't want to loose rest of my data. I have changed the power suply, power extension lead, hard drive and its data and power cables. I have fully updated McAfee virus scan enterprise 8.7.0i and vista ultimate including latest updates. Please help what could be the cause of the problem ? Could it be due to motherboard ?