I recently replaced the motherboard and power supply on my Dell Dimension 4700C. I was unable to get the exact same board that the PC shipped with, but the only difference I can see between the two boards is that the new one has a firewire connection. Everything works fine except for the network connection. When I go to the device manager, it lists the status of the network adapter (Broadcom 440X 10/100 Integrated Controller) as "This device cannot find enough resources that it can use. (Code 12)". I have tried disabling other devices to no avail. I also cannot see any drivers relating to the firewire connection to try to disable it. I looked in the BIOS for anything related to IRQ settings, but I cannot find any. Finally, I did a complete Windows reinstall, but I am still getting the same error. I do not want to use a wireless connection nor do I want to use a USB network adapter. Any advice?

In BIOS, disable any devices you don't use. Serial ports, parallel ports, IRQ for VGA, IDE (if you don't have any IDE devices), floppy, etc etc.

I do not have serial ports, parallel ports, or IRQ for VGA in my BIOS. I disabled floppy drives and Firewire, but I am still getting the same error that there are not enough resources.

sure sounds like an IRQ conflict -- go thru the list and write them all down

Below are the only BIOS menu items I have and some of the settings:
System
System Info- None of these fields are changeable
Processor Info- None of these fields are changeable
Memory Info- None of these fields are changeable
Date/Time
Boot Sequence
Onboard or USB Floppy Drive (not present)
Onboard SATA Hard Drive
Onboard or USB CD-ROM Drive
Add-in Hard Drive (not present)
Onboard Network Controller (not present)
USB Device (not present)

Drives
Diskette Drive- "Off"
Drive 0: SATA-0- "On"
Drive 1: PATA-0- "On"
SATA Operation- "Normal"

Onboard Devices
Integrated NIC- "On"
Integrated Audio- "On"
Integrated Modem- "Off"
USB Controller- "On"
1394 Controller- "Off"
Serial Port #1- "Off"

Video
Primary Video- "Auto"
Video Memory Size- "8MB"

Performance
Hyper-Threading- "On"
HDD Acoustic Mode- "Bypass"

Security
Admin Password
System Password
Password Changes
Execute Disable Memory Protection- "On"

Power Management
AC Recovery
Auto Power On
Auto Power Time
Low Power Mode
Suspend Mode

Maintenance
SERR DMI Message- "Off"
Load Defaults- "Cancel"
Event Log- "Mark All Entries"

Post Behavior
Fast Boot- "On"
Numlock Key- "On"
POST Hotkeys- "Setup & Boot Menu"
Keyboard Errors- "Report"

Here is the list of IRQ Resources when viewed by type:

(ISA) 0 System Timer
(ISA) 8 System CMOS/real time clock
(ISA) 9 Microsoft ACPI-Compliant System
(ISA) 13 Numeric Data Processor
(ISA) 14 Primary IDE Channel
(PCI) 10 Intel(R) 82801FB/FBM SMBus Controller - 266A
(PCI) 16 Intel(R) 82801FB/FBM PCI Express Root Port - 2660
(PCI) 16 Intel(R) 915G/P/GV PCI Express Root Port - 2581
(PCI) 16 Intel(R) Radeon X300 Series
(PCI) 17 Intel(R) 82801FB/FBM PCI Express Root Port - 2662
(PCI) 18 Intel(R) 82801FB/FBM USB Universal Host Controller - 265A
(PCI) 20 Intel(R) 82801FB Ultra ATA Storage Controller - 2651
(PCI) 21 Intel(R) 82801FB/FBM USB Universal Host Controller - 2658
(PCI) 21 Intel(R) 82801FB/FBM USB2 Enhanced Host Controller - 265C
(PCI) 22 Intel(R) 82801FB/FBM USB Universal Host Controller - 2659
(PCI) 23 Intel(R) 82801FB/FBM USB Universal Host Controller - 265B
(PCI) 23 SoundMax Integrated Digital Audio