This question is following things discussed in "My Toshiba Satellite Pro 6100 does not start" posted by me, so can you please refer to that while reading following...
Ok, I changed the motherboard with new one and here is what happened. I had some troubles to start the computer (it seemed that hard disk was not responding - I just had Toshiba logo on screen and I couldn't hear HD working) but I managed to start it from second attempt. After some 20 min working Win XP got frozen so I restarted the computer by hardware resetting. I took out the AC and the battery, put them back and tried to start comp again but:
1) Both AC and battery Led diodes are on (light green and orange - since battery was not full)
2) When I press the start lights go of (w/o showing light on power led too) and after a moment first the AC light comes on and then after less then a second battery led goes on too.
I think that similar things happened with the previous motherboard. What could this be?