I�m having a strange problem that I�d LOVE some help with.

I updated our workhorse Blue and White G3/350 from OS 9.1 to OS 10.1.5/9.2.2
yesterday, and have consequently lost almost all network abilities to and
from the machine. It is currently hooked into an 8 port 10baseT ethernet
hub, which is hooked to a cable modem rented from AT&T.

At 9 AM yesterday, running OS 9.1, it was fully capable of accessing both
the LAN and the internet. No cables were pulled or damaged between the
initial install and the beginning of troubleshooting.

Here are the steps:
1. Clean installed OS 9.1
2. Installed 9.2.1 update
3. Installed 9.2.2 update
4. rebooted into 9.2.2
5. inserted Mac OS X CD (rev 10.1.2), clicked �Install Mac OS X� button,
rebooted machine from OS X CD
6. Installed Mac OS X 10.1.2
7. upon startup in 10.1.2, Software Update ran and found a plethora of
updates to install (Mac OS 10.1.5 combined update, Applescript 1.8.3, DVD
Player, etc.). I selected the appropriate updates, and clicked �Install�.
8. After approximately 5 MB download, the machine lost its connection and
the install stalled.
9. I confirmed that the TCP/IP settings were correct for our ISP
(attbi.com), and were identical to the previous settings in OS 9.1. They
were.
10. Checked network connectivity. Appletalk and file sharing were both
enabled. The machine failed to connect to (in or out) a Powerbook G4 running
OS 10.1.5. The machine would, however, connect TO an iBook on the network
which was running OS 9.1, but would not accept connections FROM that
machine. 
11. Downloaded the updates it had asked for on a different machine, burned
them to CD, and installed them. Brought machine up to 10.1.5. No difference
in connectivity.
12. Played with settings in the �Network� preference panel. By changing
small details in the DHCP ID blank (making up bogus ids) and clicking �Apply
Now�, it was possible to refresh the internet connection for approximately 5
MB of throughput. This continues to be possible. The machine will refresh,
re-establish the same IP, and then work. The connection will taper off and
stall within a short time, and the IP address as reported by both the
Network pref panel and the Network Utility stays the same (a �real� IP:
24.225.132.64 � NOT a 169.254.1.194 (dead) IP).
13. Began troubleshooting software: rebooted into OS 9.2.2, tried internet
and LAN functions. Appletalk worked fine (could connect to the machine and
from the machine), but internet functionality was identical � short bursts,
then death.
14. Rebooted into old/original 9.1. Same problems.
15. Began troubleshooting hardware: tried different computer with the same
network cable: worked fine. Hooked cable modem directly to the B&W G3: no
results � dropped connection. Took all other computers off the network:
still no connection.
16. Both the iBook AND the Powerbook G4 are buzzing along happily, sharing
the cable connection through the same hub, regardless of which network cable
they are plugged in to. Neither of these machines can connect TO the B&W G3,
but B&W G3 can connect to the iBook (OS 9.1). It cannot connect to the
Powerbook G4 (OS 10.1.5).

I have since deleted ALL the updates and OSs that I installed, and clean
installed 9.1, 9.2.1, 9.2.2, OS 10.1.2, and OS 10.1.5 AGAIN. Same problems.

This seems like a hardware issue to me � that I somehow fried the ethernet
card on the computer, but I know NOTHING about troubleshooting networks. I
just don�t understand why it will connect intermittently: it works like
crazy for a minute or so, then dies. I fiddle with the software settings, it
takes off again, then dies. Does this sound like a hardware issue to those
of you with more expertise in this area? If this is the case, is it a
replaceable part? How much does it cost? Is it user-replaceable? Can I
purchase a network card to install in an empty slot in the machine? I found
a Siemens 10/100 PCI card for $5 at Circuit City - will that work?

TIA

Jonathan Cole


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