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Operation system not found

I ran across your blog you wrote to something I was looking up and you said:
Your hard drive is most likely bad or the ribbon cable is not connected.

My computer gets a black screen that says Operation system not found and then I also notice media test failure; check cables. You mention about ribbon cable is that the same thing. Do you have any suggestion. I tried booting the cd OS and change the bios to boot to cd first and it doesn't work. I'm thinking it's the hard drive or MBR is shot.

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