Powermac 8600/250 won't boot with graphics card

[r34per]

I bought a mac edition ati rage 128 (apple pn 630-2858) to use with my power Macintosh 8600/250, as my monitor doesn't play nice with the onboard video with a vga adapter. When i have the card connected, it powers on but doesn't seem to boot. I don't hear the hard drives doing anything and even after waiting a few minutes I can hit the power button and it will instantly turn off. If the card isnt plugged in and i use the onboard video with another monitor or a composite, it's fine. Someone told me to try open firmware, but I can't seem to get into that either, and i'm at a bit of a loss at this point. The card does seem to work- i tried it in my powermac g4 and gave me no issues at all. I'm running os 9.2.1 on my 8600, which as i understand it should have drivers already for the rage 128, right?

Here's an image of the exact card i bought-

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[B S Magnet]

I bought a mac edition ati rage 128 (apple pn 630-2858) to use with my power Macintosh 8600/250, as my monitor doesn't play nice with the onboard video with a vga adapter. When i have the card connected, it powers on but doesn't seem to boot. I don't hear the hard drives doing anything and even after waiting a few minutes I can hit the power button and it will instantly turn off. If the card isnt plugged in and i use the onboard video with another monitor or a composite, it's fine. Someone told me to try open firmware, but I can't seem to get into that either, and i'm at a bit of a loss at this point. The card does seem to work- i tried it in my powermac g4 and gave me no issues at all. I'm running os 9.2.1 on my 8600, which as i understand it should have drivers already for the rage 128, right?

Here's an image of the exact card i bought-
View attachment 1761018

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As memory serves, when I used to run a Power Mac G4 with the ATI Rage 128 PCI card, I tried using the card in other, older Apple hardware and remembered that it was a hit-or-miss affair, depending on whether certain firmware-based updates on the Mac had been run previously or not.

Fortunately, there is still a site with both drivers and firmware-related updates for running the ATI Rage (which here is grouped with the Radeon series) on legacy Macs. The legend it uses to indicate a “ROM-related” update (firmware) — with the “” — is a helpful guide. (For example, is your Mac capable right now of parsing OpenGL 1.2.1 instruction?)

One caveat to consider when updating all the required components is to take note of which version of Mac OS you’re running: some of the updates require OS 9.1 or earlier to run a firmware update (and will require you to possibly have to create a partition to install with a pre-9.2 version of OS 9 in order to run the updates or else booting from a different hard drive with a pre-9.2 System Folder).