hi everyone i need help on this please urgent i have this macbook pro a1281 core 2 duo and nvidia 9400m 256mb graphics 2008 mode board id:820-2330-A at first the problem is corrupted os so i reinstall with new os and it working fine when i shut it down and stayed overnight off and this morning ill try to power on but it cannot power on magsafe has green light and if i put back the battery it has orange so it charging and i checked also the bios chip 3.3v is present.what could it be the problem with this?please help if you have a working bios ill try to flash the bios