I need to be able to dual boot run two OSes, each having using a different PCI-E graphics card.
OS A - card A (primary, 16 lanes PCI-e x16 slot)
OS B - card B (secondary, 8 lanes PCI-e x16 slot)
"A " works most of the times but "B"... thing is if I plug DVI cable from card A to card B and reboot computer it won't make it to even POST screen. I am just getting no signal on the monitor.
Now, I can temporarily have OS B work with card A, fiddle inside it installing / uninstalling / enabling / disabling hardware drivers / components then reboot and occasionally OS B - card B will be picked up by pre-boot loader screens, bootloader and then properly work inside OS B.
What I am looking for is a way to make the POST / bootloader screens show up when DVI cable is attached to either card. Mainboard is an extremely cheap and old Asus M2N-SLI deluxe (notice I am not interested in its SLI function), however reading through its user manual it comes clear that what I am looking for should be supported with this MB. And, well, it is supported, just not always.
sequentially booting
accurately describes what your trying to do. That indicates you are booting to one operating system and from that operating system you boot into another.sequentially
is a serial sequence.