HT201240 I can't enter to enter password on login screen!

Please help I have already performed the erase of the PVRAM with the cmd + alt + P + R and I can't get to the login screen where I can type my password to enter to the OS. Please please help!!... I have a MB pro core 2 duo 4 gb RAM late 2008 I think it is!... Thanks in advance

I managed to solve this I took out the batery let the machine rest for a while and now it works well... I don't know what happen

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