Connected to wireless network but yellow sign and no internet

Laptop with Windows 7 is having trouble connecting to my home wireless network. The status of the connection in the system tray is shown as connected but there is yellow triangle sign on the network icon and no internet. The other devices, including another laptop with Windows 7, are connecting fine to the network and internet. Any suggestions how to troubleshoot the problem?

Check if your date and time is set right

Ignore the wifi network and connect it again? Below is copied from google:

1. Start Network and Sharing Center.
2. In the Tasks pane, click Manage wireless networks.
3. Right-click the connection you want to delete, and then click Remove network.
4. In the Manage Wireless Networks - Warning dialog box, click OK.

Open a CMD prompt type ipconfig /all post results this is normally wrong password

It got fixed by itself. The next day i turned on the laptop it connected without issues, so i don't know what was the problem.