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If the start up sound plays and the hard drive sounds normal try connecting the computer to an external monitor. If the external monitor shows the desktop just fine then the cable connecting the laptop to its screen is probably going bad.
If the computer will not boot at all try zapping the PRAM by
Pressing the power button and then command-option-p-r before the gray screen comes up.
Hold those keys down until you hear the startup chime.
Let go of the keys and let the Mac reboot.
If that doesn't work try booting from an install disk and run a repair utility.
is the monitor running through a vga connection? sounds to me like the mobo is bypassing the connection your using and sending your video signal elswhere. did you change any settings in the bios? try other video outputs to get the screen on then go into bios settings and change the video output to a connection your familiar with. help is here if you need it :)
please connect the external monitor and to do these steps "Desktop --> Properties --> Settings --> Advanced --> Utility
Manager --> Driver Mode Settings --> Under Driver Mode select
Multimonitor option from the dropdown list" .
did you changed frequency of that monitor? if it is out of factory setting that could be the problem, try to connect it again as secondary and set Hz to default, if that does n't work try same settings on both monitors? i have connected two monitors i had same problems , my secondary monitor was clone for tv if you are using secondary monitor for clone to ty (with s-video or whateever) if tv is old it must be 60HZ 800x600...