I would like to point out that I have seen a number of different machines (different CPUs and brand names) booting to a blank screen with Haiku. And all of them have been fixed by adding a VESA file to: /boot/home/config/settings/kernel/drivers/vesa
I create a text file using the text editor containing the line 'mode 640 480 32', and a important detail that I just discovered today while setting up a multi-boot is that you *MUST* hit enter/newline after typing the above, otherwise it still will not work but will look the same as the working version if you just read it.
The only reason I spotted this detail is that the files were diffirent sizes.
Jope this solves some problems out there.