My son’s laptop can no longer connect to our router. He is running Windows 7 on an HP Pavilion g4. The error message when Windows tries (and fails) to resolve the problem is “Wireless Network Connection” doesn’t have a valid IP configuration. Looking around the internet, there are a lot of people with this problem, and it’s been around for years, and only a few where it’s been resolved. I’ve tried several solutions to no avail.
If I run ipconfig /all from the command line, a lot of information comes back. One relevant line is:
Autoconfiguration IPv4 address: 169.254.115.172 (prefferred)
where the 169 indicates some kind of DHCP problem. I’ve tried manually setting the IP address to 192.168.1.1xx, for several values of xx, to no avail. I can post the whole result, if needed. I’d need to boot his laptop into safe mode (see below).
A bunch of information:
Another son has the identical laptop, with no problem.
My son’s laptop used to connect without any problem. this began Sunday.
No one else has a problem connecting on their own laptops.
I can’t connect from my account (on his laptop) either.
There is an unsecured router nearby. He can not connect to that either.
I tried connecting by ethernet cable, and get basically the same error.
If the laptop boots into Safe Mode, it can connect without any problem, for both me and him. It can also connect to the neighbor’s unsecured network. I didn’t test the ethernet connection, but assume that also works in Safe Mode.
I have tried restoring to a restore point from before the problem, to no avail. (There’s an error about not being able to restore a particular file (a configuration file from Avast anti-Virus software. Microsoft’s information dialog that says this doesn’t say if everything else worked, or if it had a problem with one file and immediately gave up, like it often does. Microsoft’s information dialog sucks.) (I will try an earlier restore point.)
I have tried manually setting the IP address, to no avail.
I have powered off and turned back on the router. (Anyone suggesting setting it to factory defaults needs to explain why he can’t connect to another router either, since that will be a lot of work.)
I have tried ipconfig /release followed by ipconfig /renew (I think the last command failed).
I have tried the commands in post 2 here, including trying them while in Safe Mode:
I have gone into Device Manager and deleted the Network Adapter, and let Windows find it again.
I have tried other things, I think. Hard to remember.
Anyone with any other ideas?