Dynex Displayport to HDMI Adapter works Win7, not 10.6.7

Hey, all,
I have an interesting problem.  I have a 27" iMac, 3.2GHz i3, I think mid-2010 release.  It is running 10.6.7, and Windows 7 Pro 64.  Windows is booted using BootCamp.  I also have an older Apple 23" Cinema HD monitor.  I bought a Dynex Displayport to HDMI adapter yesterday and hooked the 23" monitor to use a 2ndary display.
When I use OS X 10.6.7, the external monitor turns on but doesn't display.  It is detected:
Displays:
iMac:
  Resolution:          2560 x 1440
  Pixel Depth:          32-Bit Color (ARGB8888)
  Main Display:          Yes
  Mirror:          Off
  Online:          Yes
  Built-In:          Yes
  Connection Type:          DisplayPort
Cinema HD:
  Resolution:          960 x 600
  Pixel Depth:          32-Bit Color (ARGB8888)
  Mirror:          Off
  Online:          Yes
  Rotation:          Supported
When I boot Windows 7 the 23" monitor works fine.
I've tried resetting the NVRAM, and that didn't help. 
Anyone out there have any idea why this is happening?
Thanks!
D

Hey K T,
Thanks for the answer.  I'll take a look at SwitchRez.  Here's the output from System Profiler:
TI Radeon HD 5670:
  Chipset Model:          ATI Radeon HD 5670
  Type:          GPU
  Bus:          PCIe
  PCIe Lane Width:          x16
  VRAM (Total):          512 MB
  Vendor:          ATI (0x1002)
  Device ID:          0x68c0
  Revision ID:          0x0000
  ROM Revision:          113-B9850K-133
  EFI Driver Version:          01.00.416
  Displays:
iMac:
  Resolution:          2560 x 1440
  Pixel Depth:          32-Bit Color (ARGB8888)
  Main Display:          Yes
  Mirror:          Off
  Online:          Yes
  Built-In:          Yes
  Connection Type:          DisplayPort
Cinema HD:
  Resolution:          1920 x 1200
  Pixel Depth:          32-Bit Color (ARGB8888)
  Mirror:          Off
  Online:          Yes
  Rotation:          Supported
As you can see, it is detected, and if I press the "Gather Windows" button, I get a system preferences -> Displays pane to configure it.
Thanks!
D

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