Troubleshooting RSD. Part 2. Solution!!!!!!!!!

Question

Today i spent an hour at my local Apple store talking with Apple Genius and i discovered some important things.
First of all i reproduced exactly the RSD issue by letting macbook shut down and by fixing it with fan speed issue as explained in my previous post.
What follow is a supposition maybe it's true maybe not, it's an important feedback of a user.
Fan speed is not managed by firmware but by Mac os X.
What that means?
The firmware update it's not the cause to RSD issue... firmware update would fix this issue maybe.
RSD ISSUE is caused by 10.4.7 update. Why?
Well, Mac os X manage fan speed and firmware update fixed mooing fan issue. What's wrong?
Combination of firmware update and 10.4.7 update caused RSD.
What was not convincing me is this :
I use this macbook with windows and RSD for temp halt is present same as running mac os x.
So i asked myself, is it possible that 3 separated operating system (Linux Ubuntu Dapper 6.06, WIndows XP professional SP2, and Mac os x 10.4.7) suffer same RSD issue?
I answered myself, it's impossible, it is an hardware fault because common thing between these O.S. is hardware and hw configuration.
Well this is the conclusion :
Mac OS x manage fan speed, windows xp boot from BIOS , linux too.. Macbook does not have bios, EFI instead of it.
What's on EFI Partition 200MB?
maybe a bios file for emulation something like that or other important thing..
And this is the trick.
1) 10.4.7 killed thousand of macbook
2) boot camp probably write a file to 200mb EFI partition emulating a bios.
3) Mac os x is not managing fan speed and it's configuration maybe has been written in 200EFI partition so ....
4) Windows XP will use same configuration of Mac os and linux too...
And now?
well, nothing simpler... just Format Everything with write all zeros option, delete all partition , windows linux.
Restore from DVD and if you want install boot camp 1.1 and so on.
I didn't believe this could fix until i started my macbook from an external firewire Hd (Mac Os 10.4.6)... well fan doing it's job.
On my macbook as i said fan is always low speed, by starting up with external HD fan working full speed.
Backupping now

Answer 1

This topic has been discussed over and over. I'm not sure there is any one problem...
With that said, a few things to notice.
1. Fan Speed is controlled by power management (ACPI). Under BootCamp (Ubuntu and Windows), the information needed to control the fan speed is the current temperature of the processor and the current fan speed. Using this information, the fan controller portion in the OS can make informed decisions for controlling the fan. However, the information comes from the BIOS. Since the MacBook is emulating BIOS through Bootcamp (for both Ubuntu and Windows), it seems that this could indeed be a firmware issue. I guess I'm assuming that if the firmware was incorrect and the firmware feeds the BIOS emulator the necessary temp information, then the firmware could easily be the cause. This would also make OS X systems overheat. Therefore, there IS a common thread among all three operating systems.
2. What if this is simply a hardware issue. If I understand correctly, cool air is drawn in around the keys and exhausted through the vent under the LCD. Just looking at my MacBook, I notice that there is very little space for air to flow since my LCD seems to block a good portion of the vent. Therefore, if the processor is running at full speed for a decent amount of time, it simply may produce too much heat for the fans to dissipate. This is very dependent on how a user uses their laptop and heat can damage things so if it happens once, it may be more likely to happen again. This too would effect all three operating systems.
At the end of the day, there are many reasons why the overheating occurrs. Simply do your best and keep sending your MacBook in for repair until they fix it for you. I'm sure they are looking into the problem and will discover a fix in the near future.