Dynamic Switchable Frequency of CPU causing overheating

You laptop could be overheating.
When the CPU overheats then it will shutdown (i.e. thermal overload) and won't boot up again until it has cooled down.If this is the problem is not fixed then the CPU will eventually fail.
A faulty fan causes this problem or the fan and heat sink assembly are cloggedwith dust.
Check the CPU fan to see if it spins freely, if not replace the fan. If the fan and heat sink is clogged withdust the remove the dust and make sure the vents are clear and dust free. Use acan of compressed air to do this.

I have a similar problem with my A200. I have to change this setting to Always Low, and also disable the second core, otherwise the computer switches off and restarts. In case it was due to driver updates, I used the Recovery Disc to restore Vista and observed the same problem.

The problem is probably not in the motherboard itself, but may be internal to the laptop.
From what you've described the problem is either in the AC Adapter itself or in the power supply inside the laptop (the area where you plug the AC adapter into the computer.
The first thing to try is another AC adapter if you can get a hold of one or purchase one if need be as it's the most likely source of the problem. More than likely it's providing enough power for the system to recognize it's attached and draw power from it, but there is likely a short inside it or the cords keep the power from being constant.
If you do not have a full adapter to test with, you can replace the end that plugs into the wall with and universal plug - something you can buy at major retail stores. The adapters take a lot of wear and tear and can be damaged from all the stuff we put them through.

The cpu get overheated and will shtdown to protect it. The fan continues to run until a CPU safe temperature is reached / sustained.

1. Use laptop on flat surface, not on pillow, carpet, bed, etc. that will restrict air flow. Using a can of compressed air, clear the air vents.

2. If the symptom continues, then the heat conductive paste between the cpu chip and the heatsink is no longer effective (hardened, too thin, etc.). Remove the heatsink and add thermal paste
($6 Radio Shack).

Remove your laptops covers, you'll find a Fan, make sure there is nothing stuck in it, if there is , your laptop will overheat, cause that fan keep you CPU cool!!!

This problem is likely caused by overheating. The CPU reaches a temp to high and shuts the system down. When you try to turn it on the system is still to hot and it will not let the computer power on. You can try blowing out the fans and heat sink with an air compressor or can of compressed air. If this does not help the problem you may need to have thermal compound reapplied. If that does not fix it it will need a new heatsink/fan/

No the BIOS is not a replaceable chip. Yes the BIOS can be reflashed once the computer is working. And, definitely Yes. An overheated CPU will definitely cause a shutdown.

Could be hardware or software problems, IF its hardware issue the only problem makes this if the Cpu fan doesnot work, so the Cpu gets hot and then it shutdown in order not to be damaged. but mostly its software issue that remeber if you installed any program before this is happen, and try to stop shutdown by this command, if you did this and this stop shutting down your laptop this is absolutley software problems or programs conflict:
hit Start, then Run , then type this : shutdown -a
this will stop your shutdown if it works, try to uninstall the last programs causes this issue,if it doesnot let you use safe mode command.
Regards

I’m happy to help further over the phone at https://www.6ya.com/expert/mustafa_06f84c65ab5cc745

it could be swiching off due to over heating ? as most laptops do for saftey lisen to here if your fan is working ?

Yes its fixable. Fan noise is most the time related to excessive usage of CPU resources. Best thing is to uninstall unnecessary applications. Do complete maintenance. Remove no essential startup items by using MSCONFIG.
Also you can use Disk Clean up

Please post if you need further assistance. Good Luck