Dynex Displayport to HDMI Adapter works Win7, not 10.6.7

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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

iMac, Mac OS X (10.6.7), Mid 2010, 3.2GHz i3, 4GB DRAM

Posted on Jun 19, 2011 5:05 AM

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Answer 1

DGEllis Author

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Jun 19, 2011 5:07 AM in response to DGEllis

NOTE: I was trying to troubleshoot then when I set the resolution on the 23" monitor to 960x600. The mysterious behavior happens when it's set at it's normal resolution of 1920x1200 also.

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Answer 2

K T

Level 7

23,889 points

Jun 19, 2011 5:12 AM in response to DGEllis

Using System Profiler, check the bus to see if the monitor is properly recognized.

As well, confirm the product is compatible with OS X. And finally, Google for SwitchRez X...it may help you configure support for that monitor.

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Answer 3

DGEllis Author

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Jun 19, 2011 7:12 AM in response to DGEllis

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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Answer 4

DGEllis Author

Level 1

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Jun 19, 2011 5:31 PM in response to DGEllis

Curiouser and curiouser...

I booted my iMac on the install DVD and the 2nd monitor came right up. So, somewhere between 10.6.3/4 and 10.6.7 something crept into my system that broke it.

Any advice all?

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