fc5 hangs on startup

[Pietri85]

hello,

I have a strange problem. When I start fedora core 5 it all goes well, it loads all the staff and then the screen is blue. For a few seconds this is normal, after that the login screen should appear. But on my box the screen is blue for a long time and only pressing ctrl+alt+F5 takes me to the login screen. But then I can't surf in the internet, firefox browser says that he isn't able to find the server...
When I reboot after this issue the box starts up normally and I can surf in the web and so on. Can anybody tell me what this is (perhaps a bug?) and how I can solve this?

mfg, Pietri85