My d-link 2640t wireless router suddenly no Wi-Fi

Unplug the router's AC power adapter for 5 minutes to ensure all capacitors have drained. Plug it back in and the router will reboot.
If your wireless doesn't start working. Log in to your router and check your wireless settings

this is all i could find out..
The way to fix this is to unplug both your modem and your router (you may have one piece of equipment that acts as both) and wait a full 60 seconds. Then plug them both in again and wait for all the lights to stop flashing. At that point, try to reconnect to the Internet again.22 Mar 2017

What To Do If Your Wi-Fi Suddenly Stops Working ' Tech for Luddites

https://techforluddites.com/fix-wi-fi-problems/..
or go to this link.
WIFI just stopped working Google Search

Thanks for visiting FixYa!

The Mototola Droid Cell Phone has WLAN from the factory. That is, it has Wi-Fi 802.11b,g. So, you don't need to install it. Wi-Fi is already in the phone.

Here is a link to your owner's manual in case you don't have one handy. http://www.motorola.com/staticfiles/Support/US-EN/Mobile%20Phones/DROID-by-Motorola/US-EN/Documents/Static-Files/DROID_UG_Verizon_68000202474a.pdf

To connect to Wi-Fi see page 4 of your user guide for instructions.

Wi-Fi connect

To connect to an available Wi-Fi router, touch Menu Key (bottom of the phone and just left of the center of the phone) > Settings > Wireless & networks > Wi-Fi settings. (And turn Wi-Fi on.)

The password that my Iphone required was the 20 digit key located on the sticker as WPA-PSK. Hope this helps someone!

Wi-Fi base station: Understanding and resolving a blinking amber status light Your Wi-Fi base station status light blinks amber.
Here are some of the more common reasons that the status light may blink amber:

• The Wi-Fi base station has not yet been configured because it is new.
• The Wi-Fi base station has been reset.
• A new firmware update is available for the Wi-Fi base station.
• No IP address is available for the Wi-Fi base station.
• A Wi-Fi base station in Extended Mode is out-of-network Wi-Fi range of a primary Wi-Fi base station.
• The WAN Ethernet cable is unplugged from the Wi-Fi base station.
• The Wi-Fi base station lacks a path to the Internet (or local router).
• Internet access may be temporarily unavailable from your Internet Service Provider (ISP).
• Your AirPort Time Capsule has detected that the internal hard drive has reported a SMART error, and is failing (This requires firmware 7.5.2, and AirPort Utility 5.5.2).

A persistent, blinking, amber status light indicates that your Wi-Fi base station may require your attention.
How to resolve a blinking amber status light alert
Launch AirPort Utility to determine why your Wi-Fi base station status light is blinking amber.
Apple recommends that you use AirPort Utility 5.5.2 for Mac, AirPort Utility 5.5.2 for Windows, or a newer version of AirPort Utility if one is available.

1. AirPort Utility 5.2 or later opens automatically if your Wi-Fi base station requires your attention. You may also choose to launch AirPort Utility at any time.
   Do not use any version of AirPort Utility earlier than 5.0.
   In Mac OS X, AirPort Utility is located in the Applications > Utilities folder.
   In Microsoft Windows, AirPort Utility can be located by clicking Start > All Programs > AirPort.
   Note: You may also locate and download the latest Wi-Fi base station firmware and software by clicking here.
2. In the AirPort Utility window, locate your Wi-Fi base station and double-click on it to open the Summary window. Note: If you have more than one Wi-Fi base station, double-click on the icon for the Wi-Fi base station that has the amber circle next to it.
3. When the Summary window appears, double-click the amber circle to the right of Wi-Fi base station Status to open the Status window.
4. The Status window lists any conditions that require your attention. Respond to each item until there are no more items listed.
   Important: You must reset the Wi-Fi base station using the reset switch to re-enable checking for the conditions you ignored.
   
5. 
   
   Eliminating the blinking, amber status light may require making changes to a specific setting, or putting a checkmark in the "Ignore" checkbox beside any option you don't wish to change. A checkmark simply tells the AirPort that you are aware of the issue and you have chosen to ignore it. For example, you may wish to leave your AirPort open without a password so that anyone can join your wireless network.
6. Click Update to apply your changes (the Wi-Fi base station will restart).
7. After the Wi-Fi base station has restarted, the status light should be green and not blinking. If the status light stays amber in color and blinks after the Wi-Fi base station restarts, you may repeat the steps above.

Resolution If you know there is a nearby Wi-Fi network, but you are unable to locate it on the Settings > Wi-Fi screen:

• Move closer to the Wi-Fi router or hotspot.
• If you are using a personal Wi-Fi network, verify the Wi-Fi router is connected to power and turned on.
• Wi-Fi networks configured as "closed" or "private" do not broadcast the network name to Wi-Fi devices.
  • Join a "closed" or "private" network by tapping Settings > Wi-Fi > Other and entering the Wi-Fi network name, security, and password.

After joining a Wi-Fi network, if you notice the signal strength is low or intermittent

• Move closer to the Wi-Fi router or hotspot.
• Check for any sources of potential interference.
• Remove any cases or attachments on your device that could interfere with a Wi-Fi signal.

If you are unable to access the Internet while connected

• If you are using a commercial Wi-Fi network that requires a special login or subscription, see this article for more information.
• If you are in a location with multiple Wi-Fi networks, verify that you are selecting the correct network.
• Verify that the Wi-Fi network settings are correct:
  • Tap Settings > Wi-Fi.
  • Locate the Wi-Fi network you are currently using and tap
    

• You can configure network-specific settings, including IP address, DNS, and Search Domain settings.
• Use "Forget this Network" to reset settings for this particular Wi-Fi network, including the password. This is also useful if you identify a network issue and want to prevent the device from automatically using this network in the future.
• Use "Renew Lease" to acquire new IP address, DNS, and Search Domain information from the Wi-Fi network.
• Note: If the Wi-Fi network uses MAC address filtering, you will need to add the MAC address to the access list for the Wi-Fi router. The MAC address for your device is listed as the Wi-Fi Address in Settings > General > About.

If you are still unable to join a Wi-Fi network, or are unable to access the Internet while connected, try the following

• Restart the device
  • Hold the power button until "slide to power off" appears. Slide to power off your device. When it is off, press the power button to turn it back on.
• Reset network settings by selecting Settings > General > Reset > Reset Network Settings. Note: This will reset all network settings, including passwords, VPN, and APN settings.
• iPhone only: If you continue to experience issues, consider turning off Wi-Fi and using the cellular data connection instead of Wi-Fi.

Additional Information If using a Wi-Fi router at home, refer to your user manual/documentation to assist you with some of these suggestions.

• Check the manufacturer's website for your Wi-Fi router for firmware or software updates.
• Verify the Wi-Fi router can broadcast an 802.11b/g signal. If using a 802.11n Wi-Fi router, consult the manual/documentation for how to configure the Wi-Fi router for 802.11b/g compatibility.
• If you are using multiple WEP keys on your Wi-Fi router, try configuring your Wi-Fi router to use only a single WEP key.
• Try or resetting (or turning off and then on again) your Wi-Fi router. Note: If your ISP also provides cable or phone service, check with them before attempting this step to avoid interruption of service.
• Disable wireless encryption or security on the Wi-Fi router to rule out encryption issues. If this resolves the issue, try using a different encryption or security protocol.

1. Dear! Check your notebook wireless settings and correct it if it is necessory.

2. Chekc your wireless router settings may it need to update for your notebook.

Good Luck

Connect your router to computer with ethernet cable.
Then access it with following link.
http://192.168.1.1 or
http://1921.168.0.1

type user name as "admin" and password as "admin" or blank or "password"

Then configure your router as WEP.
Then go to wireless and check that wi fi is enabled.

Then go to wi fi security and add WEP key it is your password to connect your wi fi.
Also enable dhcp if you want get ip auto to computers.
configure your wan settings as your internet service provider like dns ip addrses.
Then save settings and restart the router.

Now go on your laptop first turn the wi fi switch on your laptop .
Then check that your wi fi network adapter driver is proeprly installed.Also check in my network places that your wi fi is enabled.
Then double click on wi fi icon and click on "View wi fi networks."
then connect then enter password which you set in router wep key.

Let me know if you need more assistanse.
Thanks.

look around ur laptop, there should be a button key or a switch 2 turn it on. if look on the bottom right on ur taskbar, there might be an icon for ur connections e.g. bluetooth, wlan, wi-fi etc. see if u can switch it on from there. if u still can't do it take ur laptop 2 a pc world center and they might be able to help u. i hope dis helped =)

Many Wi-Fi issues can be resolved by doing the following:
Basic troubleshooting

• Tap Settings > Wi-Fi and turn Wi-Fi off and then on again.
• Verify that you are in range of your Wi-Fi router or base station.
• Confirm that your Wi-Fi router and Cable/DSL modem are connected to power and turned on.
• Check whether other devices (portable computers, for example) are able to connect to the Wi-Fi network and access the Internet.