Very strange ethernet problem with iMac G5

Thanks in advance for your help.
I am helping my boss dust the cobwebs out of our network infrastructure (I work for a relatively small company in Michigan). In doing so, I unplugged all the ethernet cables out of our Linksys 24-port 10/100 switch and blew the dust out of the unit using canned air. I did not spray any of the propellant from the canned air and get anything wet.
Once I finished cleaning the unit, I powered it up and began plugging cables back in. I decided to try to group all the workstation cables into the first few ports. There are only 7 workstations. The switch indicated that all 7 were connected at full duplex and activity LED was blinking on all 7. I plugged our file server, AirPort and uplink to internet into the last 3 ports, and all the unused cables into the remaining ports. All 24 ports have cables plugged in, but as I said there are only 7 workstations plus the 3 other devices I mentioned. The remaining dozen or so cables lead to unused wall jacks. All ports on the switch were filled before and after the cleaning.
Here's the problem. One of our workstations, an iMac G5, suddenly was not able to connect to the internet. I checked in the network settings to make sure IPv4 was configured correctly. This particular machine has a manually assigned IP of 192.168.1.16/255.255.255.0. Router and DNS are also manually set. It has to be manually assigned - a public IP forwards to it via NAT in our DSL modem/router.
I decided to termporarily change this to DHCP. Our DCHP server is on another machine running OS X Server 10.4.11. The DHCP server is configured to assign IPs from 192.168.1.101-200. However, when I set the iMac in question to get its IP adderess through DHCP, it is assigned an IP of 169.254.179.148 (or something close to that). Confused, I checked the DHCP log on the server and found no entry for the problematic iMac requesting an IP.
I then turned off TCP/IP for the ethernet port, set TCP/IP to DHCP for the AirPort, and renewed. I got IP of 192.168.1.107. So it works properly with AirPort. Disabled TCP/IP for AirPort, FireWire, Bluetooth, enabled using DHCP for ethernet, and renewed. Got 169.x.x.x again.
Also tried switching ports on 24-port switch (tried 4 different ports), running a 50' CAT5 cable to another ethernet port in same room. Moving machine into the room where the switch is located seems pointless as I've tried multiple ports and cables already. None of my attempts has fixed this problem.
Please help!

So it works with AirPort but not over Ethernet?
Have you tried creating a new location in System Preferences Network pane, and setting Ethernet up from the default settings?
Make sure the iMac G5 is not set up to do +Internet Sharing+ (using the Ethernet port); look in System Preferences Sharing pane, and turn OFF +Internet Sharing+ if it is currently ON.
Is one of the other workstations a Mac? If so, you could use it to test the iMac G5's Ethernet port, by connecting it directly and using +File Sharing+ (I suppose you could do that even with a Windows PC).

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I can't use the mouse or anything else, and after a while the fans start to go on max. This is the second time I encounter this problem within 30 days. What I have noticed is that the day before, the brightness of the screen started to "blink" slightly -- like if the screen tried to adjust itself.
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I just restart with the power button and everything is working OK. I made an Extended Hardware test without any problems detected.
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Apr. 18, 2006
bob north
I repair Apple products, and recently I've seen strange and erratic display problems with the G5 flat-panel (iSight) 17" and 20"...and I am very curious about the origin. The picture will display what I will call "plaid pixles". Upon boot, the dispaly appears normal, but within 5-10 minutes, either at desktop or in ASD, the normal display will "crash" to the "plaid" display. The desktop, or whatever, can still be distinguished in the background, but it is overwashed by the plaid patterns -- which do change slightly, and also cover the full space of the screen. I've seen different scenarios, 3 in 2 weeks, where the symptom is exhibited with no particular failure pattern -- both before and after repair. I've replaced the main logic on one occasion, with no fix...but the 2nd try replaced both display panel and inverter. The display issue was fixed, but the system exhibited lockups only when it reached the destop. Another repair the same issue was seen after replacing the 20" main logic, where the symptom was not present previous. Personal opinion of the late 2005 IMAC flat-panels, in the hardware sense, is the likelihood of component manufacture issues, possibly the main logic boards or the panel displays themselves. Repair of this model, as opposed to the earlier, non-iSight flat-panel 17 and 20" models are extremely difficult -- access to main componenets is blocked by the display panel, which must be removed for each troubleshooting attempt. The internal hardware design is not oriented for repair ease...they are by far the most difficult to work on.
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Apr. 19, 2006
Robert Mohns
bob north describes: "...recently I've seen strange and erratic display problems with the G5 flat-panel (iSight) 17" and 20"...and I am very curious about the origin. The picture will display what I will call "plaid pixles". Upon boot, the dispaly appears normal, but within 5-10 minutes, either at desktop or in ASD, the normal display will "crash" to the "plaid" display. The desktop, or whatever, can still be distinguished in the background, but it is overwashed by the plaid patterns -- which do change slightly, and also cover the full space of the screen."
Does it look anything like this?
http://downwardspiral.net/gallery/pbg4-display
My nearly 3 year old Titanium PowerBook G4 just did this one day, out of the blue. The problem went away after a few minutes, but I had already taken photos. Thanks to those photos, Apple gave the powerbook a new logic board.
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Hubert

Hubert Frank,
To Apple Discussions!
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The knowledgeable users will need this info to avoid the "been there, done that" senerios.
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