Hello, I have a Acer Aspire 5734Z with windows 7 OS laptop that the keyboard wont work on. I have tried several different things and nothing seams to work, upgraded bios, tried boot from disk. keyboard wont work at start up so cant get into bios screen. Mouse pad works, usb works. can use usb keyboard. In windows in the Device Manager window the keyboard is listed and says it is working fine. I have checked the connection on the board many times and even bought a new one thinking the old one was bad. The motherboard had went bad, so replaced it, keyboard work before. I anyone can help me fix this you can email me at lesr2001@hotmail.com