I'm installing gentoo on a P4 1GB (genkernel stage 3), and everything is working just fine, except when booting into the new install, video dies out just before the login prompt appears.
 

I'm thinking gentoo's stdout isn't tied to the monitor. I can log in and do stuff blind, theres just no video. Where could I find the log file, so I can edit it from a bootable linux Cd and check for any odd messages?
 

Are you trying to boot into text or GUI mode? This is determined by /etc/inittab:

id:3:initdefault: = text mode
id:5:initdefault: = GUI mode

You can overide this at your lilo/grub prompt, eg for text mode type:
linux 3

You could also try selecting different video modes at the boot prompt with something like:
linux vga=791

or

linux vga=ask

It does sound as though your monitor setting may be incorrect for X, ie it is outputting a display that your monitor cannot handle. For error messages examine /var/log/messages and /var/log/XFree86.0.log or /var/log/Xorg.0.log

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