Wifi "No internet access" on laptop, other devices OK

The process I would follow
1) if it works on the LAN at all points
then i would goto the main router and make sure it works on LAN there
then i would try and connect to the main router wireless
if that does not work
then
and adapter issue - or something blocking

so I would first remove any firewalls trial or otherwise and use the removal tools to do that
then i would try safemode with networking
then i would do a tcp/ip reset
then i would check using xirrus - what channel the router is on and what signal strength i get
then a sfc /scannow
then a chkdsk

2) if LAN is not working , then i would do some of the above until i get the LAN working

if you look for any of my posts - you will find all the instructions on other posts - rather than make this a huge post
otherwise if you are onsite now
you can try things out and post back - i'm around on/off all day today UK time
and other from the US will be around later today

ok Nick - enjoy

next I would run xirrus on the pc - just in case the wireless is not seen , it maybe on channel 12/13 which is not support by some US hardware and in UK 12/13 is OK - seen this very often
if you have another working PC - use xirrus on that to check the channel in use - if it is on 12/13 - log into the BT hub and change to use 1-11
I suspect with 3 wireless signals the channel is not the issue - but looking at the obvious things first

post an xirrus screen shot from the faulty pc

and do a tcp/ip reset

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Run Xirrus Wi-Fi Inspector
Download and install
If you cannot access the internet with this PC, then you will need to copy the program across to the faulty PC
Save the file to a USB flash drive or other removable media. Plug it into the working computer with internet access and copy the file and install the program.
You will now need to take a screen shot and copy that back to the working PC and attach the screen shot in a reply on the forum here.

If you do not have another PC - do you have a phone connected to the internet - can you photograph the result and post the image in a reply

http://www.xirrus.com/Products/Wi-Fi-Inspector.aspx
( the site now appears to require a business email, and does not allow webbased emails like gmail,hotmail or yahoo etc )

Use the links below

http://www.pcworld.com/downloads/file_download/fid,77196-order,4/download.html
http://www.softpedia.com/progDownload/Xirrus-Wi-Fi-Monitor-Download-99109.html

Then run and install the program - on a wireless enabled PC/Laptop
if you get an error - You will need to have NET Framework installed for the WiFi Inspector to function.
On windows 8 - (i do not have windows 8) but, it would appear that, When you first try to run, you may get a message that .net framework is needed, and included in that message is a link to download/install.

Run the program

A user guide is available here
http://www.xirrus.com/cdn/pdf/xirruswifiinspectorguide1-2-0

post a screen shot of the program running.
if there are a lot of networks showing can you click on "networks" top lefthand area - so we can see all the network information.

post which SSID name is yours, its located in the list, under network "Adapter Name" (1st column)


Note:
For a reliable (or robust as the Xirrus user guide says) wireless connection you need a signal of about -70 dBm or better. "A desirable signal level for a robust Wi-Fi connection will be green".
note: the signal level is a negative number, so for example -88 is worst and -40 is better

To post a screen shot of the active window.

Windows XP
Hold the Alt key and press the PrtScn key. Open the Windows PAINT application (Start> All Programs> Accessories> Paint) and Paste the screen shot. You can then use PAINT to trim to suit, and save it as a JPG format file.

Vista or Windows 7
you can use the "snipping tool" which is found in Start> All programs> Accessories> Snipping Tool
http://www.bleepingcomputer.com/tutorials/how-to-use-the-windows-snipping-tool/

Windows 8
you can use the snipping tool > Open Snipping Tool (From the Windows 8 Start Screen, type "snip" and press enter.
>Press the Esc. key.
>go back to your Windows 8 start screen - Swipe from left or press Window Button
>Press Ctrl+PrntScr button to use Snipping Tool
see here
http://www.pcadvisor.co.uk/opinion/windows/3415854/how-take-screenshot-in-windows-8/
http://www.pcadvisor.co.uk/how-to/windows/3405830/how-take-screenshot-in-windows-8/

To upload the screen shot to the forum, open the full reply window ("Go Advanced" button) and use the Manage Attachments button to upload it here.
Full details are available here http://library.techguy.org/wiki/TSG_Posting_a_Screenshot

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TCP/IP stack repair options for use with Vista/Windows 7/Windows 8

For Windows Vista/Windows 7/8

For Windows 8

In the command prompt window that opens, type the following commands:

Note: Type only the text in bold and red for the following commands.
ReStart (reboot) the machine.

If you receive the message
Please note and post back - if you receive the following message :-
Access is Denied
This often occurs with windows 8

please post back the results in a reply here - its important we know that these commands have worked correctly and not produced any errors
right click in the command prompt box
select all
enter
control key + C key - to copy
then reply here and
control key + V to paste

Details also here
http://support.microsoft.com/kb/299357
also the link has a Microsoft Fix it , which will do the above for you

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OK Etaf,
I'm back from the beach. It's still too hot to sit indoors so will make a start on the daunting-looking procedure you suggest later. In the meantime, these screenshots might interest you.
First, info about the WAPs: BishopRock1 is a few feet from my PC, it's on channel 4; Longships2 is the other side of a 2-foot-thick granite wall, it's on channel 3; Sevenstones is further still and beyond another wall, it's on channel 2; the main router is out of range, it's on channel 1.
wifi 1: I think I left the PC connected to Sevenstones, it is connected OK but the signal is very weak.
wifi 2: disconnected from Sevenstones & connected to BishopRock1 (no internet access).
wifi 3: disconnected from BishopRock 1 & connected to Longships2 - connected OK but weak signal.
wifi 4: disconnected Longships2 & re-connected to BishopRock1 - connected OK!
wifi 5: taken seconds after wifi 4 - lost internet access from BishopRock1
Further notes: the LAN was connected throughout this sequence; I had similar problems this morning when I tested close to the main router i.e. only brief internet access via the router, other WAPs weak.
Can I shorten the procedure you suggested?
Nick

did you try the tcp/ip reset

try - try safemode with networking (sometimes wireless does not work with safemode )

For other windows version, XP,Vista, W7 as the PC starts keep tapping F8 - a menu appears - choose
safemode with networking - see if that works

would you expect such a low signal on the AP you mentioned
maybe try

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Try reseating the wireless adapter

If the adapter is easily accessible, usually through a cover on the bottom of the laptop.
Remove and reinsert carefully and firmly several times to cure any possible looseness or corrosion.
At the same time check to make sure the antenna leads are securely attached.
Note: This is not taking the machine apart. We do not recommend removing the keyboard when that is necessary to find the wireless.

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When/if you post the Xirrus screen shot please also show ...

Open a (black) Command Prompt window:
Hold the Windows logo key and press r; in the Run box type cmd and click on OK.

Type the following command:

IPCONFIG /ALL

[Note that there is no space between the slash and ALL.]

[Press ENTER after each command.]

Right click in the command window and choose Select All, then hit Enter.
Paste the results in a message here.

If necessary use a text file and removable media to copy the results to a computer with internet access.

I've made a start on the process but I may have made things worse!
First I searched how to do TCP/IP reset and found MicroSoft 'Fix It for me', which looked like a great idea! That lost me all wifi - see wifi 6 (3Connect refers to a 3G dongle, which I no longer have). Since Fix It makes a restore point I rolled back but that made no difference.
Next I tried Safe Mode with Networking - see wifi 7, still no wifi. I plugged the LAN back in - see wifi 8, it now says connected to Sevenstones but actually I'm physically connected to BishopRock1 (Sevenstones is 30 foot and 2 granite walls away on a different CAT5 cable to the ethernet switch by the main router).
Can't do any more tonight. Should I continue tomorrow with Xirrus or try a manual TCP/IP reset next or ...?
Nick
(I don't have another PC here but can respond with LAN connected.)