For the last few weeks the built-in ethernet on this little beast has not provided an IP address. Renewing the DHCP lease does nothing as well. I've tried different Cat5 ethernet cables as well.

Any ideas as to why this is occurring and what to do about it?

System specs:

Blue/White G4 with Rev 2 motherboard

896MB RAM (3x256, 1x 128MB)

40GB hard disk

Apple-ROMed DVD drive

USB2/FW400 PCI card

2x Rage 128 PCI video cards

MacOS X 10.4.11