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My Toshiba Satellite L755D , laptop just "Black Screened". No Beep , No display on an external monitor either. I can hear the fan running and it trying to boot from DVD on startup. I removed RAM and start up, it just give me long beep.

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You don't even see the BIOS and POST messages at the beginning? The screen is always black from the first moment when you turn the machine on? – terdon Dec 6 '12 at 16:30
    
Yes, No BIOS and POST message, nothing, just power on and fan is on. I did unplugged power cord and hold power switch for 1 min, nothing happen. But it gave me long beep when I removed RAM and turn ON it. – Mat Dec 6 '12 at 18:34

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