Hi all.

First time poster, love the website:)

I'm trying to upgrade my very first PC I had as a kid, which is a Pentium III 450 Mhz / 320MB Ram / Intel SE440BX motherboard running bios version P12 (most recent released).

I've got 4 AGP graphics cards to choose from:
- ATI Rage Pro Turbo 8MB, this one has a single 1.5v notch in the board - works fine
- ATI Rage 128 Pro 32MB, with two notches in the board (1.5v and 3.3v) - works fine
- ATI Radeon 7000 32MB, TVO, with two notches in the board (1.5v and 3.3v) - doesn't boot
- ATI Radeon 9000 64MB, TVO, with two notches in the board (1.5v and 3.3v) - doesn't boot

For some reason, the PC doesn't boot with the latter two. It's stuck at just before POST and doesn't even let me into BIOS (i.e. it's stuck at 'Entering SETUP' loading screen).

I've already tried:
- using one of the graphics cards that works, flick the AGP Aperture size in the BIOS from 64M to 256M and back
- using a different boot drive (in case it would have been a driver issue or something)

Any ideas as to what the issue might be?

Thanks in advance.