Please check the following conditions:
1. Overclock : If you have made your CPU/memory running at a higher speed, please change it back to normal speed; because the power supply could not accept this kind of loading when you install a new VGA card on the system.
2. Power Supply : We've always suggested a power supply with 350W~400W for most AGP series products, so you might need an equivalent or higher power supply. If this VGA card includes an external power connector, please make sure the power supply connects to the vga card ONLY. We do not suggest you to connect the same cable with other devices like HDD/CDROM.
3. System Memory Config : Please try to install your DIMM moudle to a different slot of your mainboard. We have received some feedback that the system works in AGP 8x after users have changed the DIMM to another brand, or changed the slot.
4. Driver/Bios of Mainboard : Please check and update the driver/bios of mainbnoard, and make sure the bios/driver of mainboard is working with the latest version. In some cases, you might need to check with the mainboard chipset vendor ( VIA / NV / intel .... ) to make sure the driver has updated to newest version.
You could try to change these bios setting of your mainboard ---
AGP fast write: Disable; AGP aperture memory: 128MB or 256MB; AGP voltage : 1.6V

Because the components on display card are fixed, it is totally unnecessary to regularly update the BIOS of display card. Mainboard may need to update BIOS for its compatibility with new CPU, DRAM, peripheral devices, and etc. Display card BIOS updates are required only for bug fixing or other special cases. It happens rarely. Please note, we do not suggest users to update BIOS with image files that are available on Internet. It is highly likely that those image files are not compatible with your display card at all; and your display card may not work any more after such update. You would void the warranty of display card at the same time.

This issue may be due to Microsoft Windows allocate less AGP resource than minimum requirement of ATI display driver.
Please refer to ATI official webpage for more info & solution, visit: http://www.ati.com/support/infobase/4217.html 

This issue may be due to Microsoft Windows allocate less AGP resource than minimum requirement of ATI display driver.
Please refer to ATI official webpage for more info & solution, visit: http://www.ati.com/support/infobase/4217.html 

Instruction:
1. Download this file 'direcpll.dll' from the given link, ftp://driver1.cptech.com.tw/driver/3dmark03/direcpll.dll
This downloaded file includes required support for X800XT PCIE VGA card.
2. Replace the downloaded file with the old file in the following directory -- '\windows\system32\futuremark\msc\'
For more information, please visit http://www.ati.com/support/infobase/4523.html

It is due to the limitation of TV resolution and compressed S-Video (Composite) format. The resolution for generic TV is much lower than generic computer monitor.
[NTSC (525 horizontal scan lines)/PAL (625 horizontal scan lines) compares with computer resolution 1024x768 (768 horizontal scan lines)]
Also, S-Video interface is an analog compressed format.  Composite is a further compressed format based on S-Video interface (Y and C signal of S-Video is compressed into one signal of Composite ).  So, when you try to view computer display on generic TV. The image quality will suffer from lower resolution of TV and signal loss via compressed signal interface. The only advantage for TV output is generic TV screen size is much bigger than generic computer display device.

Please check the websites below for the latest updates:
ATi Linux Driver Downloads http://www.ati.com/support/drivers/linux/radeon-linux.html
ATi Linux driver FAQ http://www.ati.com/support/faq/linux.html

Please visit http://mirror.ati.com/products/catalyst/SMARTGART-White-Paper-V2.pdf
SmartGart FAQ  http://mirror.ati.com/products/catalyst/SMARTGART-FAQ.pdf

When user enables this function, ATi VGA driver will check and make sure the VPU can be recovered if it stopped working for unknown reasons.
ATI provides a white paper for VPU recover utility.
Please refer to VPU Overview file for more info.
http://mirror.ati.com/products/catalyst/VPU_OVERVIEW.pdf

Please check the following settings step by step,
Driver: Please update VGA driver to the latest version from PowerColor/ATi's website.  You will need to remove all other VGA drivers from 'add/remove program' before updating the new VGA driver.
Power supply: Please make sure that your power supply is for 300W output.  These VGA series need a stable power out to run a 3D software in a heavy loading.  If possible, please do not share the power cable of the vga card with other devices.  Sometimes the VGA card will ne unstable because of sharing power supplies. 
For AGP series VGA card,
Setting change: Please disable 'fastwrite' feature in section 'SmartGart' of ATi advanced display properities
In some cases, please try to change the AGP speed from 8X to 4X.

The first release of ATi driver included a strange status, it would detect both Radeon 9600 Pro and Radeon 9600 as 'Radeon 9600 Pro'.
This information would show up in display properities.  However, XT and SE chipset did not exist at that time.  After the release of XT & SE series, ATi changed the name of all Radeon 9600 Series chipset (PRO/non; PRO/SE) to Radeon 9600 'Series'.

This is due to conflicts between DirectX9.0B and your TV software.
Please check websites for required updates from Microsoft,
http://support.microsoft.com/default.aspx?scid=kb;en-us;825116
http://www.microsoft.com/downloads/details.aspx?FamilyID=8dfd1b6d-e177-4a0e-91d0-b4310675b02b&displaylang=en

This problem might be due to the new PCI VGA card having PCI resource conflict with on-board VGA device/other on-board devices.
Please check following settings,
Bios Setup: Please make sure the boot setting in mainboard BIOS setup has been changed to PCI device from on board VGA .
PCI Slot: Please try to install the PCI VGA card to another PCI slot, sometkmes the PCI VGA card can only work in 1 PCI slot for a mianboard with 3~5 PCI slots.
Motherboard BIOS Update: We also suggest to update mainboard BIOS.  The new BIOS may solve PCI resource allocation issue.

Please check follow settings,
Driver: please update VGA driver to newest version from our/ATi's website , and you need to remove all other VGA driver in 'add/remove program' before you update VGA driver.
Setting change: Please disable 'fastwrite' feature in ATi advanced display properities, 'SmartGart'.  In some cases, please try to change the AGP speed from 8X to 4X .
Others: In some cases, users have resolved this issue by changing the AGP voltage from 1.5V to 1.6V; please make sure your mainboard is able to support this function before you change it.

There are different models of the R9600XT VGA cards,
For earlier series, it did not include required designs for overdriving features.  We have used the memory with higher speed than ATi recommanded and enabled the VGA cards to run as fast as an R9600XT VGA card with over driver feature.
For the newest release series: Based on the new design of Radeon 9600XT VGA card, this model does have required circuits for overdriving feature, if this feature does not show up still, please update VGA driver to the newest version.

This might be due to MB BIOS setting is unable to work with a VGA card with video memory size of 256MB.
You can do the following to solve the problem,
Go to MB BIOS setup, and find/change the setting of "AGP aperture memory size" to 128MB.

Please enable the DMA mode of your harddisk in device manager.
Instruction:
1. Right click on "My Computer"
2. Select your harddisk
3. Select "Setting"
4. Select DMA
5. Select "OK" to save settings.

Please change both BIO setting of maiboard and jumper setting of the VGA to 2x mode. Some via 4x mainboard cannot support this VGA card in AGP 4x mode.

This might due to the default setting of this VGA card is set to AGP 4x mode, so please change the jumper setting of VGA card to AGP 2x mode by doing the following:
For CVR3 / CVR3S ver 1.0 AGP 2x mode: JP2 open
For JP1 2-3 short AGP 4x mode: JP2 short , JP1 1-2 short (default setting)

Please download and update a newer driver from our website.
The latest driver is able to support this feature.

The problem might be due to your mainboard or power supply.  Please make sure you have a sufficient power supply for the system to run Your power supply CG256 Series VGA.  When you start a 3D program, your system becomes unstable due to insufficient power supply, especially for a system with high speed CPU (like athlon 700 or higher).  We suggest you to change a power supply with higher wattage.

This may happen because the driver of your old 3D VGA card has some conflict with the new driver.  Please remove both drivers, and reinstall the new driver again.

Please download and install a Win2000 update file for this issue through Microsoft website.
Instructions:
1. Visit http://search.support.microsoft.com/kb/c.asp?ln=en-us
2. Select Win2000 in section 1
3. Enter Q261601 in section 3
4. Click "Go"
The search result will show up and you will see the information in Q261601.
You will then be able to download the correct update file for your Win2000.

Please enable the DMA function of your DVD-ROM in device manager. 
Instructions:
1. Right click on "My Computer"
2. Select properities
3. Select CD-ROM --your DVD ROM ---setting
4. Enable DMA mode
5. Reboot your system

If you need to use the TV-out feature, please allow your VGA card to detect your tv-set in the first place. 
Instructions:
1. Connect TV-set to system with power off
2. Power on TV-set
3. Power on system
4. Allow system to detect TV-set
5. You can now change the output device setting in the display properities.

Please make sure that you have removed the driver of your old VGA card in "Add/Remove Program", especailly for the VGA with 3D accleterate feature.  Also, please update the BIOs and AGP driver (if necessary) of your mainboard to the latest version.