One of the great things about the WordPress community is the amazing number of people who spare their time & develop plugins for the blogging platform, and to the top of all —make them FREE for everyone’s use. Plugins are piece of code that add new or improve existing functionality of your WordPress blog. Recently there has been a spat of new plugins, and updates to existing ones. Check here….
So what’s if you install a new plugin and it crashes your blog or doesn’t let your blog peform normal, in such situations, employ a logical approach to troubleshooting:
1. Study the error message, if there is one, for clues as to where in your WordPress installation the error might be.
2. Think about what you were doing in your blog immediately before the error occurred. This is the first next step, so to speak, if any error message leaves you clueless.
3. If you just installed a new plugin, or upgraded an existing one, deactivate it and try and access your blog again. If the error ends, you've found the culprit. You then need to troubleshoot the specific plugin.
4. The same goes for themes - if you're trying a new one, or installed an upgrade to an exisiting one, switch to the default Kubrick theme that ships with WordPress and try and access your blog. If the problem goes away, you've found the culprit and you'll need to investigate the particular theme.
5. If you still can't fix the problem, re-upload the core WordPress files again from the original files on your computer (you did keep them, didn't you?), paying special attention to how your FTP program treats the files. For instance PHP files shoud be uploaded as text files not binary files. If your server uses Apache, check your .htaccess file to see if there's any entry in there that might offer a clue as to the cause of the problem.
6. If any error message mentioned PHP anywhere, look for some help (and hopefully answers) from the hosting company from which you rent the space for your blog.
7. If all your troubleshooting steps fail, it's time to ask the community for help by posting a help request in the WordPress Support Forum. You'll need to be as specific as possible re the error including explaining all the troubleshooting steps you've taken to find a solution.