Whenever you have a problem with your WordPress blog,
0. Don’t Panic. So far as your WordPress database and wp-contents folder is fine, you are fine.
1. Switch to the default WordPress template and deactivate all plugins. If you are fine now, switch to another trouble free template or activate the plugins one by one to find out the culprit.
If you still have problem, it is possibly a WordPress problem. Then, search WordPress support forum for solutions and ask a new question if needed.
2. Ask your friends using WordPress for help.
3. Create a test installation of WordPress in another server and make sure it isn’t a hosting problem.
4. Try all new WordPress upgrades at the above test installation before you try with your regular blogs.
