I went to my sisters this morning and put the original HD back in. While doing that I triple checked all the connections and cables again. It booted up without any error message what so ever so now I'm fairly sure it's the HD ribbon cable that's faulty. What else could cause an intermittent problem like that? I do recall when it booted up to the error message the boot sequence didn't how any drives as having anything in it. This time the HD was listed. I also fired up the Trend Micro scan but didn't stick around to see the results. I'll talk to my sister about it later just for shits and giggles.