Internet connection failure Power Mac G5 (tower)

Internet connection fails via HS cable to modem to ethernet configuration
G5 2.5, OSX 10.4.11, Safari .... also tried Firefox
Cable installer technician made several attempts to configure Network System Preferences
All wires and external modern are new
I am still able to connect to internet via phone; Dial up
Two PC laptops connected successfully via same HS cable to modem to ethernet config
Connection with laptops required only resetting modem, without Network System Pref adjustments

Internet connection failure Part 2: Power Mac G5 (tower)
Thanks for the welcome and your assistance
About This Mac > More Info... > Network
Lots of data here, seems to match info:
System Prefs > Network > Built-in Ethernet >TCP/IP
Network > Network Status
• Built-Ethernet : Built-in Ethernet is currently active and has the IP address
71.239.164.212. You are connected to the Internet via Built-in Ethernet.
Safari :
sits blank to any http typed, with progress bar frozen
You are not connected to the Internet.
Safari can’t open the page “http://www.google.com/” because your computer isn’t connected to the Internet.
.... Activity Monitor reads: 2.35 KB/sec ( and is fluctuating ) to 6.88 KB/sec
Assist me .... > Network Diagnosis
Network Status ( all LED are green )
• Built-in Ethernet
• Network Settings
• ISP
• Internet
• Server
Proceeding through the navigation buttons, all is Green
Final Message Reads: Your Internet connection appears to be working correctly.
.... Activity Monitor reads: 2.56 KB/sec ( and is fluctuating )
Network Utility > Ping test
.... 10 packets transmitted, 7 packet received, 30% loss
I tried installing an Ethernet card into expansion slot,
absolutely No Response ( blank read-outs) in System Prefs > Networks < TCP/IP
• Encore Electronics ( $ 20.00 returnable )
• ENL832-TX-EN
• 10/100 Fast Ethertnet Network Adapte

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Internet connection failure Power Mac G5 (tower)

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