We've got the following situation. Since today SharePoint central administration and the other 3 web applications are loaded as shown below. No Windows or SharePoint update has been installed since yesterday, where everything was working like a charm.
IE developer tools show no js files loaded for central administration. I'm sorry that it's in german, but I think you get the idea. It has been working for 4 years straight until today.
SharePoint Foundation 2010 SP2 has been installed on this machine. We've tried IE, Chrome and Firefox and all of them behave slightly different, but still with no javascript available. Trying to access the sites from an other machine -> same result. Configuration wizard has been running sucessful, there're no messages in the event log which would indicate a point of error. SharePoint logs are been written, although way fewer than normal. SharePoint Cache has been recreated, IE Browser Cache deleted with no change.
When I created a backup of a content database and restored it on an other server everything was working fine. SharePoint Designers shows the same error messages, when I try to open default.aspx.
I would really appreciate any suggestions, help or maybe even solutions.