It seems none of the drivers work which i downloaded from the lenovo page. I have a ThinkCentre M55 8808 CTO
I downloaded the drivers for the M55 series but in my hardware devices, ethernet, audio, vido, pci serial, sm bus controller, all of them have a question exclamation mark.
Why are the drivers not working?
You may have downloaded the drivers but did not start installation at all.
All the drivers in Lenovo Support will only be downloaded and unpacked into a folder called "DRIVERS" which the folder located in a drive where your system is installed. Common practice of system installation is usually in C drive.
To complete the installation, you have to go into the DRIVERS folder, for instance, C:\DRIVERS and install drivers manually from there.