Notebook Toshiba L40 don't start when unplug power cable

When i unplug power cable system don't start and crash on login KDE or faster. When power cable is plug everything is ok. Tested on Kubuntu 9.04, Windows Vista and works ok. On Kubuntu 9.10 alpha 5 i have the same problem.
Sorry for my english

Hello AmlnnN,
I understand have you finished doing a little maintenance   work on the computer it now freezes periodically is that correct? I will do all I can to help you resolve this issue.
First thing lets run a couple test on some of your hardware.
See steps below:
1.       I want you to boot into the bios menu this link will show you how.
2.       Once in bios go over to the diagnostic option at the top.(Note you will need to use the arrow keys to navigate)
3.       You may see 2 test there if that is the case run both test.
4.       It may take some time so please have the ac adapter plugged in.
5.       Once the test finished press F9 to setup defaults and then press F10 to save and exit.
Also find out while you’re in the bios if the computer ever freezes there.
Pleas respond back with your results at your earliest convenience.
Thank You
Clicking the White Kudos star on the left is a way to say Thanks!
Clicking the 'Accept as Solution' button is a way to let others know which steps helped solve the problem!

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Notebook Toshiba L40 don't start when unplug power cable

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