wp-admin login error – error 500 (internal server error)

I am currently experiencing an “Error 500 – Internal Server Error” prompt when I go to log into my administrative site. My website displays fine, I just can’t login to the admin page This just started as of yesterday and I’m not sure why. I haven’t upgraded to a newer version of wordpress, updated any plugins, or mess with anything on my ftp.

After reading through some troubleshooting pages on the forum, I determined that it could possible be a plugin issue, although I’m not certain. If in fact this is a plugin issue, how would I go about resolving the issue? Would I have to copy my entire plugin folders on my desktop, delete them altogether from my ftp, and do all new plugins install for my wordpress site?

If it’s not a plugin issue, then what could the culprit be? Any help is immensely appreciated!