Magento Disable Captcha Admin Login
Sometimes captcha fails to load on admin screen or if you want to disable it manually then try following steps to do so. Magento Disable Captcha Admin Login
Step 1: Login to your hosting control panel and go to following path app/etc/modules/ open & edit Mage_Captcha.xml
Step 2: Should have true value within <active> tag, just replace it with false as shown. Change the value from true to false and save file.
Result: Captcha on Magento Admin Screen is disabled now.
Please Note: If you still have captcha on admin login after completing these steps then try clearing magento cache. If you would like to clear cache go to var/cache and delete all files.