After BOOTING my windows 7 pc, I've been unable to connect to the internet. My motherboard is an asrock m3a77ode. I've checked my bios version and its 1.80(the newest one on their website) tried resetting to default bios version and reinstalled my NVIDIA chipset drivers as well as the Realtek drivers I've been advised to use on other websites. Nothing works and theres still a yellow mark next to Ethernet controller in device manager, despite my network adaptor driver apparently functioning properly.
How to fix the broken internet after a reboot?
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 I assume First the problem might be with the IP ADDRESS.
Use command prompt ipconfig command to verify IP addresses and then check internet connection.
If the internet doesn't work still you have to check Ethernet settings.
1. Click On Start button.
2. Click on control panel.
3. Choose Network And Internet.
4. Choose Network and Sharing Center.
5. On the right there must be an option Change adapter settings click on that.
6. Right click on Ethernet and choose properties.
7. The window will pop up of Ethernet settings in that on network page there would be an option internet protocol version 4 select that and click on properties if the IP address and DNS server address are automatic choose use the following for both and fill the IP address given by your internet service provider than save the setting and reboot the pc it should work if still it doesn't work you might have to do the below given steps.
If the above steps won't work you have to try uninstalling both wired and wireless adapters from device manager and than reboot the pc drivers will be reinstalled automatically if not you have to install them manually once its done try using internet if it still doesn't work you have to use the above solution again than it surely should work.Â
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How to fix the broken internet after a reboot?
Go to command prompt start– run — cmd and hits enter.
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Then run the command "ipconfig /all "you see as below, you see what is your pc ipaddress default gateway DNS server ipaddress.
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Wireless LAN adapter Wi-Fi:
  Connection-specific DNS Suffix . :
  Description . . . . . . . . . . . : Intel(R) Centrino(R) Advanced-N 6205
  Physical Address. . . . . . . . . : A4-4E-31-D2-F0-64
  DHCP Enabled. . . . . . . . . . . : Yes
  Autoconfiguration Enabled . . . . : Yes
  Link-local IPv6 Address . . . . . : fe80::99a6:a839:f797:79b6%22(Preferred)
  IPv4 Address. . . . . . . . . . . : 192.168.1.6(Preferred)
  Subnet Mask . . . . . . . . . . . : 255.255.0.0
  Lease Obtained. . . . . . . . . . : 07 May 2015 22:36:37
  Lease Expires . . . . . . . . . . : 08 May 2015 22:36:36
  Default Gateway . . . . . . . . . : 192.168.1.1
  DHCP Server . . . . . . . . . . . : 192.168.1.1
  DHCPv6 IAID . . . . . . . . . . . : 77876785
  DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1B-57-71-B1-28-D2-44-51-D0-49
  DNS Servers . . . . . . . . . . . : 192.168.1.1
  NetBIOS over Tcpip. . . . . . . . : Enabled
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Run command "nslookup google.com" to check if your DNS is working fine.
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C:UsersJanny10>nslookup google.com
Server:Â UnKnown
Address:Â 192.168.1.1
Non-authoritative answer:
Name:Â Â Â google.com
Addresses:Â 2404:6800:4007:806::200e
         216.58.196.110