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Cant connect to the interenet. Dell Optiplex 755 and Windows 7

ibex333

ibex333

Diamond Member
So I updated an old Dell Optiplex 755 to Win 7.

The hardware is more than adequate to run this OS.

Network Card Shows an orange light.

ipconfig /all reveals an empty space for where the default gateway has to be.
ip shows as APIPA 169.254.X.X


Clearly DHCP is down

Local loopback pings just fine. No problems here.


Bad router? No. It's fine.
Problems with wires or jacks? No they are fine. I connected another PC instead and it connects fine.


Went to dells website. Installed all current drivers. Still no go! I am stomped... Please help!
 
Check the security (firewall, etc) make sure that the connection between the computer and the Router is Not blocked.



😎
 
not blocked. just checked.


disabled the windows firewall. No other firewalls - fresh windows install. Router is not blocking.
 
What do you see under Network Adapters in Device Manager? Any problems with the NIC? You could try looking for updated NIC drivers from Windows Update.
 
What is your DHCP server, your router, or your ISP?

If it is the ISP, they may be linking your account to the MAC of your host, not your modem.
 
I had this same issue when I updated the drivers on a Dell computer from the Dell website. One of the drivers I downloaded from Dell contained a virus that kept me from browsing the Internet. I could open a DOS prompt and ping an Internet address but within a browser session everything was routed to 127.0.0.1.
I downloaded Kaspersky rescue disk and performed a virus scan. It found the virus and cleaned it up.
 
Ok. This is taking place in a college. I am a Computer Lab Technician. Not really my job to be troubleshooting networks, but I was asked to do it with no pressure if I fail at the task.

I have no access to the router, but was told by my boss that the router is definitely not the issue. The ISP is not an issue either.

I confirmed this fact, by taking another identical dell computer with Windows Vista installed, and connecting it to the network cable/jack I used for the problem PC. Sure enough it works perfectly, and establishes the connection right away!

Clearly this is an issue with Win 7, the computer's hardware, or maybe some kind of a compatibility issue with Server 2008.


I disabled the firewall, and updated chipset and network drivers.
 
One possibility is that you may have run out of ip addresses within your DHCP scope. You'll need to talk to a network admin to verify that.

jlazzaro said:
install a spare PCI NIC card that you know works in W7. if all is well, there's your answer.
Click to expand...

ibex333 said:
So I updated an old Dell Optiplex 755 to Win 7.

The hardware is more than adequate to run this OS.

Network Card Shows an orange light.

ipconfig /all reveals an empty space for where the default gateway has to be.
ip shows as APIPA 169.254.X.X


Clearly DHCP is down

Local loopback pings just fine. No problems here.


Bad router? No. It's fine.
Problems with wires or jacks? No they are fine. I connected another PC instead and it connects fine.


Went to dells website. Installed all current drivers. Still no go! I am stomped... Please help!
Click to expand...

If he's verified that he's getting good loopback, doesn't this take the NIC out of the equation?

to verify my thinking above, quickly setup that workstation with the IP of one of the known good workstations. Set everything to static and check connectivity after that ( keep in mind you'll need to take that other workstation off of the network for a bit). If it works, the you probably ran out of IP addresses within your DHCP scope. If it doesn't work, then you can reasonably conclude that there is an issue with that workstation alone.
 
Last edited:
kenzo said:
I had this same issue when I updated the drivers on a Dell computer from the Dell website. One of the drivers I downloaded from Dell contained a virus that kept me from browsing the Internet. I could open a DOS prompt and ping an Internet address but within a browser session everything was routed to 127.0.0.1.
I downloaded Kaspersky rescue disk and performed a virus scan. It found the virus and cleaned it up.
Click to expand...

Well that is worrisome. Do you have the info regarding that driver?
 
Problem solved. The senior server admin had MAC Filtering on. I kept telling him to check that and he kept saying its not an issue. He was literally shocked when he found out that MAC address filtering was on, and that PCs MAC was blocked... I barely restrained myself from saying "DUHHH"
 
I have the same problem with multiple 755s. It is not a question of MAC filtering, since I did a fresh install and also have used the same connection on other machines that work fine. The 755s are the only ones giving me a problem.

Anyone have any ideas.
 
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