Unable to find DHCP-server after 5 minutes?

When I turn on my MacBook and jack in the network cable, the network and internet works perfectly. But after 5 minutes somehow it loses the ip-address gained from the dhcp-server and assigns his own ip-address. Trying to refresh dhcp settings doesn't work, and when I restart my mac, it works again... for 5 minutes, then it loses it's connection again.
I have 2 pc's connected to the same switch and they function beyond 5 minutes, so the problem is definitely with the mac. Does anyone have a clue what this could be?
MacBook Mac OS X (10.4.7)

Dag, Koen
feestelijk inhalen (is that used correctly, here?)
Does your mac have any PPPoE settings configured in the SystemPreferences>Network>Built_In>..PPPoE tab...?
My guess is that you don't need anything other than standard TCP/IP settings.
Let us know, alstublieft?

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Unable to find DHCP-server after 5 minutes?

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