MBP not displaying on HP ZR24w monitor

Hi
My 2011 MBP recongises my HP ZR24w monitor (see pic below). But it doesn't display on the monitor. I have connected it via a Neet Mini DisplayPort to DVI adapter. I've rebooted, switched sources on the monitor, toogled between mirrored display in system setting etc. No joy...
Update: Forgot to add... The monitor is usually my main monitor on my Mac Pro and was working this afternoon, so I'm sure the monitor is working.
Any help greatly received
Thanks
Wayne

The driver download pages for many HP products are currently down, but you can download the full featured Windows 7 x86 drivers for the Officejet Pro 8600 n911 from HP here: http://ftp.hp.com/pub/softlib/software12/COL40120/bi-108858-3/OJ8600_1315.exe This may not be the latest version and for the firmware update you will need to wait for the HP site to get back up or you can do a firmware update from the front panel of the printer assuming the printer is connected by wired or wireless LAN (not USB).

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