I have "updated" my Lenovo Ideapad S400 BIOS with the Ideapad S300 BIOS, and now my laptop won't start. Even if I plug the charger in, the lights keep turning off and the laptop won't turn on.
So, is there any way to fix it?
Please be informed that no BIOS update is required for this product.
My machine encounters a specific problem, only BIOS update can fix it. What do I do next?
Please contact the Technical Support for further assistance.
Source BIOS Update