Hi Farzad,
I realize this post is from well over a year ago...but did you ever replace your fan? Did it work?
My story (if you're interested): Someone recently gave me a MacBookPro 1,1. It was getting a gray screen at start up with the flashing question mark. I assumed the hard drive was bad and put a new hard drive in it. That didn't work... but when I connected the original hard drive to the MBP externally, it recognized it and worked fine. So I was then thinking that the ribbon cable to the internal HD must be dead and I can replace it for about $40. However, in checking out the other Stats, I noticed under the diagnostics this error:
4MOT/1/40000002: Left_Middle-Front
I can also find a fairly inexpensive replacement fan. My hope is that the fan went dead, which over-heated the ribbon cable to the HD. However, I'm nervous to spend money on a new ribbon cable and fan, only to find out that the damage is really on the logic board?? Since I can fire it up and everything else besides the HD is working great, I think it would be a fun project... but would love to hear that it is just the fan that needs to be replaced when you get the error above. Most of the posts in this forum were from people still under warranty and their answer was to send it into Apple... so who knows what Apple replaced?
Thanks for any insight!