Hi,
After a recent semi-failed BIOS update (had to reset BIOS through CMOS battery removal), my computer sometimes boots off the motherboards graphic card and sometimes off my 8600GT card.
Usually it'll boot off the motherboards card, I'll restart it, and it'll give me a 'No Signal' on my monitor until I switch it to my 8600GT graphics card at which point it'll work.
Specs are
P5GC-MX Motherboard
Zotac 8600GT 512MB DDR2
2GB RAM
Intel Core 2 Duo E6850 @ 3.00GHz (Both cores only hit 1.8GHz though due to motherboard only supporting a FSB of 800MHz)