GTX980 gaming 4G - Display Ports HELP ME PLEASE!!! so stressed

Hi
today I bought this video card and 3x Benq XL2430T monitors, nearly $2500 AU dollars worth of gear
and all i can do is get 1 friggin screen working via the DVI
I am running drivers 344.80
I have installed Benq monitor drivers
ALL the monitors show as all connected in windows Device manager and in NCP, 1 with the DVI, and 2x on Display Ports. when I try to activate the monitors plugged into the DPs via RIGHT CLICK on desktop and CHANGE RESOLUTION... I select one of the monitors on the display port and try to tell windows to extend desktop onto them, it reports "unable to save display settings" and the resolution/orientation are greyed out. if i boot with all connected as described i don't get any displays working, will only ever get 1x display of the desktop via DVI if booted with nothing plugged into DP's.
this is so stressing... not a nice way to start Holidays :(
can anyone help me out here??
I could get triples going on my old GTX590 using different monitors... i buy latest and greatest card and monitors and its all for POOH!!! ARGH!!!

HI Nichrome
thanks for your reply....
yes the BIOS is the latest... did it tonight (just about had a nervous breakdown in the process )
i don't mean to be ignorant but whats the OC got to do with a connection between a monitor and a video card got to do with anything ??
i have done numerous clean installs of numerous different driver versions the ones supplied with the card, 344.75 & 344.16 & lastly the supposed HOTFIX 344.80's
tried a HDMI cable for giggles and it works fine (had DVI & HDMI going simultaneously) so its only the DP's that appear to not function properly (which i need as i want to run triples at 144mhz). i tested all monitors separately via DVI and they all work fine. the Card is working fine if using the DVI or HDMI ports. the issue is specifically all of the DISPLAY PORTS
if i use a DP to DVI adapter do you think that would make a difference?

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