If you are having problems with Google sign-in, there are many factors that could be causing the issues. The first thing you need to do is to know the cause so that you can easily find the right solution. Most common problems causing Google sign-in failure include; forgotten password or username.
To be able to troubleshoot these problems and others that could be causing the log in failure, go to http://support.google.com/drive/bin/static.py?hl=en&ts=2402620&page=ts.cs, to select the issue that best applies to your specific Google sign-in problem.
If the problem with sign in process is due to forgotten password, all you need to do is to reset your password by following these steps:
Go to www.google.com/accounts/recovery or Google’s password assistance page, and then you need to type in the words to be supplied for verification process. To keep your account secured, you are not allowed to use a password that you have already used before.
Someone could be using your Account
If you think someone has gained access to your Google account and you still have access to it, change your password immediately by going to www.google.com/settings/accounts.
If you do not have access to your Google account, go to the accounts recovery page to reset your password.
Resetting your Google account password is going to require you to have a Google account set up recovery options. In case there are no recovery options that have been set up or you are not able to use them, there is going to be an account recovery link form that will appear. This form should be filled up so that you can get your account back.
Getting Error Messages
If you haven’t forgotten your password or your user name, but you can’t still sign in to your Google account, you could be getting the following error messages:
· The username or password you entered is incorrect
· Your browser's cookie functionality is turned off. Please turn it on
· Invalid email address
· Sorry, your account has been disabled
The first thing that you can do is to make sure that you are typing the right username and password, there are times that you may not notice typing unnecessary characters and such mistake can cause the Google sign-in failure. If you have check and verified that you are using the right password and username and you are still being denied entry to your account, you should go to Google’s password assistance page and then you should enter your user name. A password assistance mail will be delivered to the email address that you have used in creating your Google account.
Refreshing your Browser
One most commonly overlooked solution to problems such as Google sign-in failures is browser refreshing. Once you have refreshed you can try signing in again, but if you are being denied access to your Google account or you are still seeing error messages, go to http://support.google.com/accounts/bin/static.py?hl=en&page=known_issues.cs. This is the page where you can send feedback to Google. There will be 3 issues listed on this page, chose the Signing In, issue to send your feedback.