HELP!!! Please, black screen on start up (model; 6735s)

Hi
I used my laptop fine last night, went to switch it on today but all i get are the lights to say its on and a black screen, i can't bootup in safe mode I even tried to use the install disc for vista again to try to reformat so i could get in but nothing!! getting reallyfrustrated, could it be down to an update? or is it something else?
i have also tried a hard boot but no joy from that either. anyone got anything i'd really appreciate it
Thanks
Amanda

Hi have you tried going on battery icon, go on more power options, require a password on startup then unselect every turn off function except for shut down

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+1. Shut down the computer.+
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+5. Attach the computers power cable.+
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I'm in a fair bit of a desperate situation; my iMac's screen seems to shut down every time after the white startup screen. The Apple logo appears, & the progress wheel begins spinning, then after a while - when it would usually then go to the gray login screen - it would, instead, go black. I can tell that the machine is still on (I can still hear it clicking as it does during processing) but I'm unable to determine anything else. Nothing is visible on the screen - not even the cursor - it's as if the display had turned off completely. I'm not sure if the login screen sits beneath that black screen (I have tried to log on by typing my login details in blindly, but even if it does log in, it's hard to determine what state the computer is in without seeing the screen.
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HELP!!! Please, black screen on start up (model; 6735s)

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