About 11 months ago a customer brought me his Sony Vaio Laptop Model # PCG-5L2L. Some of the keys on the keyboard worked and some didn't, so I thought his kids had spilled something on it but when I took it apart the keyboard was clean. to make a long story short I replaced the keyboard and the computer worked great. Now he's brought the laptop back to me and the keyboard is now totally dead. If I plug in a USB keyboard that works fine. Does anyone know of keyboard problems with the model? It seems odd to have 2 keyboards go so close together. What would cause this to happen? Thanks in advance for any help with this.