No computer or monitor wanted to start. It appeared that the battery in my remote control for the switches just had enough power for the led. I “borrowed” a battery from another remote and that solved this problem. The next problem was that there was no internet connection. It appeared that I switched of the powerstrip on which the network switch was attached (amongst other things) was not in the ON position.
After that I still did not have an internet connection. This was due to the fact that we had gotten another modem last year which caused us to change all the IP addresses. When finally connected I started with updating alle the anti virus software en started checking for Windows updates on all the computers. I don’t know if it is a good sigh or not, but this check is running for quite some time now.