Hi, I upgraded a Dell C521 from Ubuntu 6.04 to CentOS5.1. The Dell has an NVidia 6150 analog video card. The screen is an LG1952Tx. After the screen blanking goes on, and the screen goes to sleep, the screen goes black except for a blue note saying: analog video, invalid frequency... I have installed the NVIDIA-Linux-x86-100.14.19-pkg1. Everything works great except for the screen sleep... Any suggestion of what I should look for? -- Thanks http://www.911networks.com When the network has to work