G5 Can't See Gigabit Ethernet Card

Some months back, I installed a gigabit ethernet card into my G5. It worked fine for a few months, then stopped working with a message: The cable for PCI Ethernet Slot 3, Port 2 is not plugged in. I wasn't working on the project that required that connection, so I just let it go. Now I need to connect to a different gigabit switch. I installed a new D-Link card into the same slot as before - same result. I moved the D-Link card to a different slot - and got the same error - still referring to Slot 3. Just for kicks, I installed the old card back into slot 2 (the one above the video card). Same error - and no mention of finding two cards or of anything in the other slots. It seems as if somehow all of the PCI slots are being ignored.
Running the System Profiler, I get a "No Information Found" for PCI Cards. None of the lights on either ethernet card come on. Any ideas? Everything else on the machine seems to be working correctly - the built-in ethernet is fine. There are a lot of drives connected to the system (4 on the FireWire 800, 1 on FW 400, 4 on USB). Is there some way to force a re-scan of the PCI bus? or turn it on?
Thanks!!
G5 2 X 2 GHz Mac OS X (10.4.8)

Thomas -
Yes - I tried swapping slots. A gigabit card worked fine in slot 3 for several months. It stopped working - I figured it was the card that was th eproblem. I have since replaced the card, and then moved the new one to a different slot. The Network control panel still reports a card in slot 3, even though there is nothing in slot 3. The new card is in slot 4 (and just for kicks the old card is in slot 2). Neither of these is recognized by the the System Profiler or the network control panel.

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↓
eMac (2005) - Technical Specifications
eMac (2005) - Technical Specifications
Configurations
EDU [no optical]
EDU CD
Combo
Super
Model
M99832
M99833
M99834
M9835
Description
1.25G/256/40/none
1.25G/256/40/CD
1.42G/256/80/Combo
1.42G/512/160/Super
Processor/Speed
G4 / 1.25 Ghz
G4 / 1.42 Ghz
- L2 Cache
512 KB (1:1)
- L3 Cache
no
Memory Included
256 MB
512 MB
Memory Maximum
1 GB
Memory Slots
2
Memory Form/Speed
SDRAM (184-pin) / PC2700 - DDR333
Hard Drive Size
40 GB
80 GB
160 GB
Hard Drive Type/Speed
Ultra ATA/100 / 7200 RPM
Optical Drive Type
none
CD-ROM (tray)
Combo Drive (tray)
SuperDrive (tray)
DVD Decoding
n/a
software
DVD+R (dual layer)
n/a
4x read
6x read; 2.4x write
DVD±RW
n/a
8x read
8x read; 4x write
DVD±R
n/a
8x read
8x read; 8x write
DVD-ROM
n/a
12x read
CD-RW
n/a
32x read; 24x write
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CD-R
n/a
32x read; 32x write
32x read; 24x write
CD-ROM
n/a
32x read
USB 1.0
on keyboard (2)
USB 2.0
3
FireWire 400
2
FireWire 800
no
Expansion slots
none
Ethernet (built-in)
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