VGA card - 2nd display

Hi!
I recently bought and installed on my PC a new VGA graphic card — MSI RX9550-TD256 TV Out/DVI - AGP.
I connected the VGA output to the PC monitor, install the drives and it’s working fine on the PC monitor. So far, so good.
I then connected the DVI card output to the VGA input of my LCD TV via a DVI cable with a DVI/VGA adapter; I changed the display properties settings for the second monitor (the TV) according to its supported max resolution (in my case 1024x768, 60Hz) but when I select the respective (VGA) input on the TV to see the PC picture, I can see nothing but the blue screen.
Am I missing something? Do I need any other special adapter/cable?
I appreciate if anyone could help me with this issue.
Thanks in advance,
Mário

Dear Richard,
Yes, I did it, but it doesn't work anyway.
It's a pity that we cannot attach files to the posts; otherwise I would send you a "print-screen" of the Display Properties just for you to see if it's all correct.
Thanks anyway.
Mário

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<http://www.mac-pro.com/s.nl/it.A/id.230/.f?sc=2&category=128>
<http://www.welovemacs.com/mcaadcvga.html>
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Model Name:          Mac Pro
Model Identifier:          MacPro1,1
Processor Name:          Dual-Core Intel Xeon
Processor Speed:          2.66 GHz
Number Of Processors:          2
Total Number Of Cores:          4
L2 Cache (per processor):          4 MB
Memory:          2 GB
Bus Speed:          1.33 GHz
Boot ROM Version:          MP11.005C.B08
SMC Version (system):          1.7f10
Serial Number (system):          Y***Q2
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Slot:          Slot-1
PCIe Lane Width:          x16
VRAM (Total):          256 MB
Vendor:          NVIDIA (0x10de)
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Revision ID:          0x00a1
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thanks
<Edited by Host>

only the 2nd port is giving this problem
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I am sorry to be so blunt, but the problem is YOU.
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Feb 15 18:18:34 Edoras Dock[157]: kCGErrorIllegalArgument: CGSCopyDisplayUUID: Invalid display 0x003f003d
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Feb 15 18:18:37 Edoras Terminal[513]: _NXGetScreenRect: error getting display bounds (1001)
Feb 15 18:18:37 Edoras Terminal[513]: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x78c8d3f5
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Feb 15 18:18:37 Edoras Terminal[513]: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x78c8d3f5
Feb 15 18:18:37 Edoras Terminal[513]: _NXGetScreenRect: error getting display bounds (1001)
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Is this a problem with the in 10.7.x included drivers?
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Quote
Originally posted by NovJoe
Low PSU power possible to affect this... Over-heating of card and CPU could also be the cause... BIOS settings could be another cause too... Trying looking into these areas as there's alot of possibilites on a general problem like this.
All the Best... :D !!!
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2nd Display Support:
Mirroring Only*
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1024x768*
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Apple reports that this system has a "VGA output port for video mirroring on an external display or projector", and supports output resolutions of "640 x 480 pixels at 60Hz, 800 x 600 pixels at 75Hz and 1024 x 768 pixels at 75Hz". However, the hardware is capable of using an external display in dual or "extended desktop mode", Apple just blocked the capability in firmware to protect sales of more expensive Macs. Unsupported third-party hacks are available.
http://www.everymac.com/systems/apple/imac/specs/imac_g5_2.0_20.html
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