A Sony Vaio CR42S laptop came in with a back light issue. Both the screen and the inverter seemed OK. The laptop started up and would work through and external monitor so I took it to bits to check the connections on the other end of the screen connector. All was OK so I put the laptop back together.
I switch it on an all I got was VAIO in the middle of the screen. I have not seen this before.
Turns out that if the DVD/CD drive is not in properly it will prevent the laptop from starting up!