Originally posted by: RLspin
The onboard video port doesn't work, how can I switch it off if I can't see the BIOS screen?
Nearly any BIOS will attempt to POST and find any kind of video that it gets an electronic reply from, but you have to hit the BIOS access key early in the process before it runs into a conflict from its current settings. Sometimes, it's necessary to cycle through the default settings to allow it to try this "anything if it works", type of attempt (you may have to move the "Clear CMOS" jumper over and back again). The BIOS's menu screens are more flexible than the screens it tries to display when it reports what it finds during its POST.
In other words, if you know the correct key to press that accesses the Setup, with some MB's and BIOSes, start doing the one-finger tap dance on that key as soon as you hit power, to "get there" before POST gets to the point of finding the conflict between what is working, and what it sees in the Setup as being what to expect.
YMMV! Good Luck.