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Weird lines on screen after installing new graphics card!

I have a Sony Vaio PCV-RS620G, running Windows XP and with 1.5 gigs of ram. I wanted to update the stock graphics card (ATI Radeon 9200), so I bought an ATI Radeon X1600 Pro.

Before installing it, I uninstalled the old graphics card driver and related software. I didn't change any BIOS settings (at that time, I didn't even think about it), but I did make sure that I had the most updated driver for my motherboard-to-AGP device (I think that's what it's called...). I shut down, took out the old driver and put the new one in (I think it's properly seated), and turned the computer back on. However, all that my monitor displays as the computer is booting up is a screen full of long, vertical, colorful lines. I can hear the computer doing its normal booting-up stuff and there are no weird beeps or sounds, but the monitor doesn't show anything but the long, colorful lines. I tried to boot up in Safe Mode, but again, I couldn't tell if it worked. I took the new graphics card out and put my old one back in, and the monitor worked fine.

Is there anything else that I should have done before installing the new card, i.e. changing the BIOS settings? If so, which ones? Could it be a bad card? Or something completely different?

Thank you so much for any help and advice!

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Does it..

In reply to: Weird lines on screen after installing new graphics card!

Does it need any kind of power supply and normaly graphics cards have a small Plug and Play factor so you can turn your computer on and install the drivers, the BIOS shouldnt do anything so dont bother with that, also what colour are the lines and what do they do?

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More about the lines...

In reply to: Does it..

No, no additional power supply required, so far as I can tell. It seems to install right into the appropriate slot, just like the old graphics card. And, when I reinstall the old graphics card (after trying to install the new one), the computer boots up just like I suppose it should - Windows boots up, and as soon as my desktop is up the "Found New Hardware" wizard comes up and installs the drivers for the old graphics card.

The line screen that I'm getting on my monitor has long, vertical, straight lines from the top to the bottom of the screen. At first they seem to be a mixture of yellow, black, green and white; then the screen goes black for a second; then comes another set of long, straight, vertical lines, but these ones also seem to have blue and pink in them.

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In reply to: More about the lines...

If you plug your screen connector into the one on the motherboard with the new graphics card in does it show a picture?

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