We helped a friend moved and received a Sony Vaio laptop. Unfortunately, it's not working. It only powers on. I tried to power it on and off a few times, and once saw the blue screen came up but there was nothing else to see. There are two numbers/models on this laptop. One is PCG-792L from the sticker under the laptop, the other is VGN-FS540P on bottom right of the screen panel. I tried looking for info on google using the PCG-792L number, but came up with nothing except for batteries, power adapter, and memory price. But using the VGN-FS540P, I was able to find some specification of that model from a webpage. I wonder if anyone here can provide me with the specification of this laptop and what could be the problem of this laptop. Many thanks in advance for your help!