White screen of death i.e. white admin page , is very common issue with wordpress site . Here are few tips that may help you to resolve this issue .
Note: Before you make any changes to your site, make sure you have sufficient backups.
Why do you get this error?
Majority of the time when you see a white screen of death, it means that you exhausted the memory limit. This could be caused by a plugin that you may be using that is not functioning properly. It could also be caused by a poorly coded theme that you are using. It could also mean that there is an issue with your web hosting server. Since the problem can be caused by any number of things, it may require a lot of troubleshooting.
Does the problem occur on your other sites?
If you have multiple sites, then the first thing you should do is to make sure that the white screen of death is happening across the board or just on this one domain. If the issue is with all of your sites, then it is a strong indicator that your web hosting provider is having some issues. However, if the issue is only with one of your sites, then this could be an issue with a plugin or theme that you are running. If the issue is only happening with a single post or page, then you know it is definitely a problem with your specific site.
Increasing the Memory Limit. Usually this issue happens because your memory is being exhausted.
Disabling All Plugins
If increasing the memory limit did not help, or if you have a high memory limit like 256M or 512M, then you need to start troubleshooting. In our experience of troubleshooting this issue, we have always found that the issue is either with a specific plugin or a theme. Let’s go ahead and disable all the plugins.
If this fixes the issue, then enable one plugin at a time to get to the bottom of the issue.
Replace Theme with a Default Theme
If the plugin troubleshooting doesn’t fix the issue, then you should try replacing your current theme with a default twenty ten theme. The best way to do this is by backing up your theme folder. Then deleting the theme. WordPress will automatically fall back to the default theme.
Alternatively, you can go in your phpMyAdmin and update the database tables in wp_options table. The following table names would have to be updated:
template, stylesheet, and current_theme. Change the value to twentyeleven.
If this fixes the issue, then you should look at your theme’s functions.php file. If there are extra spaces at the bottom, then you should consider fixing it. If you are using a poorly coded function in your theme’s functions.php file, then it can cause this as well.
If nothing helps , you should contact to your host for additional options.