There is a computer when it is left on all night and it has a screen saver, in the morning the screen is black and won't come on. The customer said it didn't do this before we came in but I kind of doubt that. Also when he reboots it, it will hang at the win95 startup screen. The only changes made was that we added a network card. Could this be the problem? It is during the driver initialization that the computer hangs on boot which could be the network card but the screen saver thing I'm not too sure about.