Stuck at logon

[Imacstuck12]

I have an older Imac G5 using osx 10.5. One day iturned it on and it booted to the logon screen, which is abnormal, I entered my password and the screen goes blue then goes back to the logon screen, and Ideas on what to do to get past this?

 

[gehrbox]

I have an older Imac G5 using osx 10.5. One day iturned it on and it booted to the logon screen, which is abnormal, I entered my password and the screen goes blue then goes back to the logon screen, and Ideas on what to do to get past this?

Caps lock turned on?