are you using a floppy boot?
I have found that the 2.4.20-18.9 kernel does not support nvidia drivers, so I will have to wait till nvidia releases a new driver, it might be the same for the radeon card. If you are using grub or a bootloader, then just pick your previous kernel, if you upgraded (-Uvh) then you are screwed, when upgrading a kernel, you should always pick the install instead of the upgrade since it is not good to replace the previous kernel.
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