try running this program. Download it to your desktop and then double click on it to run.  Check device manage to make sure there is no ! or X next to the adapter listing.  Try reinstalling the network driver.  Make sure that when you connect the computer to the modem you power down the modem, wait about 5 min, power up the modem, wait untill all the lights are active then power on the computer. It may be that the modem is linked to your other system.
Hi,   I do not use this computer for about 6 months out of the year. The last time I turned it on was Sept. 2008 and all was fine. I thought I'd better fire it up and get any system or other software updates I'd need this spring. It seems to be working fine except it says there is no connection to the internet. It's running XP. If I use the same ethernet cable and plug it into another XP computer I have an internet connection so I know the cable and my internet connection are good. If I unplug the cable it tells me I've done so. I ran "Renew IP Address" but it fails. I checked the ethernet and it says the device is functioning properly.   Any ideas would be appreciated. Thanks!
Dimension 3000 No Longer Connects to the Internet