Have you tried connecting to your mother board using a standard vga cable?
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Find your motherboard user manual and then follow this guide:
http://www.wikihow.com/Reset-Your-BIOS
2 things: either you buggered your BIOS and disabled your output or your monitor is looking for the wrong input. Both easy fixes.
Theres a small silver CMOS battery on your motherboard, roughly the size of a R2 coin. Should be very easy to spot, might need to remove gfx card to get to it. remove it, then try switch on your pc. When that doesn't work, put the battery back in and switch on pc. That will have reset your BIOS settings back to default and will sort out possibility #1 .
2nd option is if your monitor has different ways to be connected (the blue D-Sub/Serial cable and the DVI/Hdmi cable) then you might just need to press the button on the monitor that lets it know which signal to look for. If you give us model/make of monitor we can even help you find it if you dunno what to look for (might be an "auto" button, or a button that looks like it switches between 2 things).
Get back to us when you've done those things and we take it from there :)
hey guys thank you for your inputs, i did manage to fix the issue by changing to the second bios of the mobo, saved that to a usb flash and updated the main bios. worked. everything is functioning perfectly