Satellite A200 shuts down randomly - I may have a solution

Hello,
I am having a Toshiba satellite A200-1sj, but the laptop have issues and it shuts down it self randomly.
I have changed thermal paste of the CPU and GPU and this is not related to heat because it some times could power off even after first start when the board is cold. I have started the board out of the case, just bare naked with the cooling pipes on it and it would shut again, without its hard, wifi adapter or modem so this is not related to them. I have also tested with another power charger from a friends A200-23k and it still shuts down so its not about it either.
BUT !!! The big but is what I have discovered and I think toshiba is to blame! This issue is related to the voltage regulator some how and it is not working properly for some add reason. I have also found some kind of solution last night after a bios save and exit the fan stuck at 100% and the machine have not shut down since then and it looks like when the fan is regulated and it rises and lowers the voltages then the problem appears.
The sad thing is that i left the cpu from bios at low profile so it will run at only 1GHz and I am afraid to change it within bios because i may loose the 100% fan operation and the machine will get unstable again! :(.
Current bios i have is 2.60 and I am thinking to try 5.30 if the machine starts to shut down again but i think this would be no go because the fan will regulate again ;(.
Is there someone from Toshiba who can create a bios with a constant voltage for the fan so it wont have up and down times which could be less painful for the regulator i guess and may bring stability at decent noise.
I am open to any suggestions,
Best Regards,

YES I have successfully restored my bios.
Here is the URL from which you can download the proper boot disc crisis tool: http://www.mediafire.com/?3ccb9m0kv0m
You first need to make your bootable floppy disk. I have made mine with CRISDISK.BAT from the archive. This is an easy to use bat file and in some cases slight editing may be needed if the usb floppy you are using is recognized as letter B: You just search for "A:" and change the values to B:
After you have your bootable disk you have to delete the file BIOS.WPH and copy the desired bios for your model on the floppy with the same name(bios.wph).
Then you need to create autoexec.bat file. - this could be easy, you just create an text file with notepad and rename it autoexec.bat after you have the needed lines in it.
In my case i used autoexec.bat with the following lines: phlash16.exe /x /s /BBL /MODE=2 bios.WPH
When I used the bat file with mode=3 which is most common way out on the forums it did not worked but with mode 2 things went faster and smooth. Mode 3 took around 20 minutes in reading the floppy disk with a short pauses looking like flashing block by block but on the end flashing result was = BSOD. So for those who are unable to restore the bios with the guides out there you better flash using mode=2 (preserve dmi) just like I did. Still if mode=2 also is not working you may experiment with the other two options remaining.
I will explain those modes for you in case you are wondering.
0 - update the bios and not the dmi
1 - update the dmi and not the bios
2 - update the dmi and the bios (preserve dmi)
3 - update the dmi and the bios (renew dmi)
The bios mode update information above is information I found on the web in another forum so I can not take credit for it.
P.S.
The only thing kept me going when I used older versions of phlash16.exe was that it actually read the disk and it was for more then 5 seconds which mean that the motherboard was searching for the proper image and this can be a successful way to revive your bios.

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i removed the RAM and inserted the power supply, and there was no crackling sound from the processor, but when i put the RAm back , the sound is there.
just before opening, i tried booting up form a pen drive, and the laptop did boot-up half way in, till the the screen displayed "windows is starting up" , then it went OFF again,
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Try my steps.
What to do if your Mac shuts off randomly
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Next, try resetting your SMC.
Resetting the SMC of an Intel-based portable Mac with a battery you should not remove on your own
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Then, try resetting your PRAM.
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Shut down the computer by going to Apple () > Shut Down…
Select Shut Down or allow the computer to shut down automatically.
Turn on the computer by pressing the Power Button.
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Shut down the computer by going to Apple () > Shut Down…
Select Shut Down or allow the computer to shut down automatically.
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Select the Erase tab.
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Follow the instructions.
I hope I helped.
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IdLikeMyIphoneIf... wrote:
OK, i'll come back again later. Here in Germay it's 1:30AM now, so it's quite difficult to call the nearby AppleStore.
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Hi Argenisss,
I'm sorry you are having issues with your Macbook Air. Since your post indicates you have the latest version of the operating system, I would suggest resetting the System Management Controller (SMC)
Intel-based Macs: Resetting the System Management Controller (SMC)
Power
The computer doesn't respond to the power button when pressed.
A portable Mac doesn't appear to respond properly when you close or open the lid.
The computer sleeps or shuts down unexpectedly.
The battery does not appear to be charging properly.
The MagSafe power adaptor LED doesn't appear to indicate the correct activity.
Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer.
Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.
Another troubleshooting step would be to reset the PRAM as well:
About NVRAM and PRAM
Resetting NVRAM / PRAM
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
You can read more details by clicking on the two links above, but these would be two good troubleshooting steps to try.
Hopefully, this information will help ....
- Judy

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