Satellite Pro A300 PSAGDE re-booting when plugged in

I have had this laptop put away for a while as I couldn't work through this problem, but I'm having another try.
The laptop is a Satellite Pro A300 PSAGDE.
The problem I am haiving is that the laptop would re-boot whenever I connect the PSU, but not when using a live CD (Ubuntu).
I would like to try and flash a replacement BIOS to see if that will solve the problem.
Unfortunately the software needed to flash the BIOS requires the laptop to be plugged in.
Is there any way around this problem?
Can I fool the software into thinking it is plugged in?
Is there a way I can revert/repair the BIOS in any other way as obviously the problem hasn't always been there.
Thanks
Message was edited by: miainphillips
Message was edited by: miainphillips

So once again: notebook runs fine using battery power but reboot always (in the loop????) when AC adaptor is connected. But using Live CD the notebook runs ok even if the AC adaptor is connected.
Right???
>> I think it may be a BIOS issue because the laptop will run without an issue when booting a live cd, even when it is plugged in.
If the unit runs ok using Live CD, then this means that this cannot be BIOS issue because BIOS does not depend on installed system.
Therefore in my opinion its definitely not a BIOS problem.
I think you should firstly disable the automatic reboot when an system crashes Win 7 is configured to restart immediately when a BSOD happens and this happens too fast to see the error I think you mean this by automatic reboot
Disable this by following way:
1)Control Panel -> System & Security -> System -> click the Advanced system settings
2)Locate the Startup and Recovery section near the bottom of the window and click Settings button.
3)In the Startup and Recovery window, uncheck the check box next to Automatically restart.
4)Now click OK and restart the unit
In my opinion the system crashed and therefore the notebook reboots

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