My friend dropped a Lenovo B570 I built and sold to him. Now it will not do anything other than light the white LED telling us the battery is fully charged.
I have disassembled and reassembled it twice, down to removing the processor, to see if disconnecting everything for a while would make a difference. There are no obvious breaks in the motherboard or anything else. I've tried a spare on/off switch and cable. Nothing works.
Can anyone give me ideas?