I have dell d630 laptop, today i open it and on it. at the stage of log on i enter my password to log on. but when i pressed Enter key after entering password it becomes as it is Deadlock. Not being off and not show my Desktop. then i disconnect battery and again connect, press start button but it loads bios (first stage at start when there appears a screen). the problem is that it loading bios again and again (repeatedly) do not start complete.