I have been running SharePoint on a vm for testing purpose for a while. Today when I started the servers I can't access sharepoint any more. I have checked all the application pools and they are running. The logs shows that SharePoint are running since I am getting the usual logs BDC errors and so on. Do you have any idea of how I can access SharePoint or what to do in order to debug the problem? So I can't access the Central Administration even if I use localhost but I can see all the information through SharePoint Manager 2007.

Could you please be more specific on what do you see if you open SharePoint web site in browser?