Welcome to TSG:
Let's see if I underatand your issue.
You have lan connectivity on all pc's but no wireless connectivity on any ?
As far as you know,no hardware/software changes around this time ?
Have you tried moving one of the laptops closer to the router just to see if this is a signal issue?
Have you tried changing the wireless channel?(1/6/11 in US is preferred)
Have you tried a router reset ?
Have you disabled encryption on the router as a test ?
Then let's see these from a failing pc:
Wifi test exe. Hint from Johnwill
Download and run Xirrus Wi-Fi Inspecto from
www.xirrus.com/library/wifitools.php
on the problem machine. Post a screen shot of the main screen here.
To post a screen shot of the active window, hold the Alt key and press the PrtScn key. Open the Windows PAINT application and Paste the screen shot. You can then use PAINT to trim to suit, and save it as a JPG format file. To upload it to the forum, open the full reply window and use the Manage Attachments button
to upload it here.
Note that this application requires NET Framework to run. If you get an error about a missing function, download and install NET Framework.
And:
From a Johnwill post on the Networking Forum
Try these simple tests.
Hold the Windows key and press R, then type CMD (COMMAND for W98/WME) to open a command prompt:
In the command prompt window that opens, type type the following commands one at a time, followed by the Enter key:
NOTE: For the items below surrounded with < >, see comments below for the actual information content, they are value substitutions from the previous IPCONFIG command output! Do NOT type <computer_IP_address> into the command, that won't work. Also, the < and > in the text is to identify the parameters, they are also NOT used in the actual commands.
Do NOT include the <> either, they're just to identify the values for substitution.
IPCONFIG /ALL
PING <computer_IP_address>
PING <default_gateway_address>
PING <dns_servers>
PING 74.125.45.100
PING yahoo.com
Right click in the command window and choose Select All, then hit Enter to copy the contents to the clipboard.
Paste the results in a message here.
<computer_IP_address> - The IP Address of your computer, obtained from the IPCONFIG command above. (For Vista/Win7, the IPv4 Address)
<default_gateway_address> - The IP address of the Default Gateway, obtained from the IPCONFIG command above.
<dns_servers> - The IP address of the first (or only) address for DNS Servers, obtained from the IPCONFIG command above.
If you are on a machine with no network connection, use a floppy, USB disk, or a CD-RW disk to transfer a text file with the information to allow pasting it here.
Wifi test exe. Hint from Johnwill
Download and run Xirrus Wi-Fi Inspecto from
www.xirrus.com/library/wifitools.php
on the problem machine. Post a screen shot of the main screen here.
To post a screen shot of the active window, hold the Alt key and press the PrtScn key. Open the Windows PAINT application and Paste the screen shot. You can then use PAINT to trim to suit, and save it as a JPG format file. To upload it to the forum, open the full reply window and use the Manage Attachments button
to upload it here.
Note that this application requires NET Framework to run. If you get an error about a missing function, download and install NET Framework.