Admin Login Problem - Joomla! Forum - community, help and support

hi all

i'm absolute beginners joomla, 1 year ago have used joomla 1.5 , i'm using 2.5 new site.

after preparing site, activated on line last friday, working ok.

yesterday evening saw login in user in user menu missing link "profile", there button logout.

i started admin modules published , saw 2 login modules, 1 published , 1 suspended. trashed 1 because thought not used.
afterwards went user menu , saw 3 active link: "send article", "send link" , 1 can't remember (sorry stayed till 3 in night trying recover , i'm tired).
so disable these 2 , left third on active.
i went on page , pushed button logout see if changed , saw couldn't logout user.

i closed admin page, site page, closed browser , reopened it.
i went administrator page, wrote user , password , big surprise couldn't login anymore.
if write wrong user or password page , click on login button inform me wrong, if write correct login information remain on login page.
the same happen if try login user login, correct user/password page remain same, if write wrong user o password redirect error message page.
i have read several post nothing helped, don't see things described in posts, need proceed step step.

please there can me? i'm despairing

sorry "bad english" , patient me, have knowledge html, css i'm complete newbie joomla , database.

thanks in advance.
giorgio

sounds may have disabled 'joomla authentication plugin' if case simple edit of database. see viewtopic.php?p=2905442#p2905442

for future reference http://extensions.joomla.org/extensions ... ackup/1606