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Have you tried:

– deactivating all plugins to see if this resolves the problem? If this works, re-activate the plugins one by one until you find the problematic plugin(s).

– switching to the default theme to rule out any theme-specific problems?

– resetting the plugins folder by FTP or phpMyAdmin? Sometimes, an apparently inactive plugin can still cause problems.

– re-uploading the wp-admin and wp-includes folders from a fresh download of WordPress?

– increasing the available memory?
http://wordpress.org/extend/plugins/memory-bump/
http://wordpress.org/support/topic/253495#post-1017842

i have been able to fix the problem i was having
it was an error in my CSS file (i think) i did something with the style.css file and it started working again.