Gigabyte 4550 Bad Choice?

Gateway 4300E Low form Factor,
Mother board Intel Corp D915GUX,
CPU Intel Pentium 4,
1391 MB of free memory/2045 MB Total, 350W Athena Power Supply

Looking for a low profile card to up grade a failing ati radeon 4300/4500 series card.
Has to be low profile, preferably with a fan/sink, but thin.
I recently purchased "Gigabyte HD 4550", but can't get it to work!
Display will not function correctly, display has lines and fractured look to it. (looks like an extremely low resolution)

I have re-seated the card, Installed the Catalyst soft ware that came with the card(ATi Radeon HD 4550 Series Graphics Acclerator Driver CD) 12DC1-HD455HM-10CR, and hydro Vision. Have adjusted resolution to 1024x768 Res on a Samsung SyncMaster 19" monitor.

Nothing seems to work, although I can re-install my old ATi Radeon HD 4300/4500 Series card and the display is fine? (less the sparkling green spots) I either picked a non compatible card, or the card is bad.
I don't do a lot of gaming on this machine, just some Myst and Rivien. Mostly photo editing and viewing.
Thanks in advance, for any help
N2

Definately sounds like the card is bad. I would return it. See if the dealer can offer an alternative...

The card was purchased from a vender on e-bay, I have contacted him but am doubtful I will be able to return.

Not knowing a lot about comparing the specs of the card to the specs of my PC, I picked what I thought would work size wise and compatibility wise, Unless there is some type of electronic incompatibility, I would guess I received a bad card as well.

Any suggestions as to a card that might suit the size restrictions,MO board and power requirements would be greatly appreciated! NOTE I'll be buying from a retail vender this time!
I'm afraid I may be missing something as for as mother board requirements, when it comes to picking a card!
And would really like to get one that is compatable with my system the first time. A small form factor (Low profile, Single slot, PCIe) card with a fan/sink would be awesome.
I don't do a lot of gaming on this machine, just some Myst and Rivin, the pc is mostly used for photo editing and viewing.

Thanks
N2

Thanks for the link Ivan, but I would like to stay around the $40.00 Mark and must stay THIN (Max. 23mm), as well maybe If my 350W Athena Power Supply isn't so great I should go for a lower wattage card?
The PSU is new, I added it because I didn't want to under power a new card, but I have to make this work, I have already sunk too much money into this old box!
I just need to find a video card that will work good enough with I have. I have looked till I'm blue in the face!
Thought you guy's might know of something that would work with what I have....
Thanks
N2

Primary Video Adapter is set to <Ext PCI Graphics>
N2

That looks perfect Ivan, Thanks a lot! I'll check out the specs.
N2