my lenovo thinkpad labtop when powered on will only a show a power on light,and the fan will turn and stop but nothing will di

Which model, and how old is it?
I had that problem recently with my new X140E. Lenovo repaired it under warranty, after sending me an overnight shipping box. I had it back not more than three days after I sent it (I actually think it might have been two), with a new motherboard, and no data loss.