External Monitor Stopped Working with OSX but fine with XP

I have a viewsonic Monitor that im connecting to mbp via hdmi-dvi.
It has been working fine for the last 9-10months but has all of a sudden just stopped being detected.
If i Boot up in windows i have no problems as the monitor is detected fine, but with OSX 10.5.8 all i get is the Grey/blue screen change on the mbp when its connected to mbp or when monitor powered on or off.
There is no change to external monitor though.
I have tryed resetting the PRAM
when i go into sys pref/display, it does not detect a second monitor
I have been looking around for a few hrs now with no luck, any help would be great

Have tryed having monitor unpluged for a whole day and that didnt work, cant see any reset button on monitor.
tryed resent PRAM and PMU, tryed booting in safe mode, tryed booting from OSX disc
but didnt quite understand :
"If you see video when started up from disc, you may have corrupted software. You can use the Archive and Install feature of the Mac OS X installer to reinstall. This kind of installation gives you a fresh version of Mac OS X, but you don't lose any data from the computer as your old information is all archived."
it just booted up and asked if i wanted to install another copy of OSX.
only thing i havnt tryed from the above help is the rm command part of the out of range mac mini, and im a little cautions about that
-i can still use it fine via bootcamp, i just have to go into video settings and tell it to use dual monitors, is there anything like that on osx ? only thing i can find is the display button in sys pref and that only gives me the option to detect displays which it dont do very well.
Thanks

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It is a fantastic place to find answers and suggestions!
For you to have the best experience in the HP forum I would like to direct your attention to the HP Forums Guide Learn How to Post and More
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I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
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External Monitor Stopped Working with OSX but fine with XP

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