The next step is to put it back to its original condition to see if it still works as before. If it doesn't some board has died and you decide if it's worth replacing the motherboard.
Hi I have an old sony vaio vpceb3l1e laptop which had a faulty keyboard and trackpad so I dismantled it with the aspiration of putting it inside a flight case and using it with an external mouse and keyboard. When I connected it to the power supply (not original) the first time after dismantling it, it started up and turned off for some reason and when i went to switch it on the second time it wouldn't start up, what could be the problem?
1st time start up
2nd time start up attempt
any help would be very much appreciated !!