Login again and again... but neve stop...

[super.ismiti]

Hi,

My Ubuntu is stopping during the login...
I turn on the computer and the system begins... but when it reach the login,
I try to enter but everytime I try to do the login the system comes back to
the login again...
I can't pass by the login... I used right both user and password... but it
don't accept... the system shows a black image (like an error) and after
come back to login...
What could I do to solve this problem?

Thanks in advance,
Ricardo.
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