I have vista installed on my hdd and just recently switched my broken Gigabyte P35 to a Gigabyte G31 (different chipsets?). Anyways, the bios loads and the dvd rom & hdd are recognized from what I see. I've set first boot device to hdd, second boot device to dvd room...etc. Well, my pc seems to skip loading from my hdd and tries to boot from the dvd room. I get the error "CD/DVD Boot: Disk boot failure. Insert system disk and press enter" like it's expecting there to be an os cd in the drive to boot from.
I was kind of hoping it would detect my copy of vista and "fix" itself from there. My actual vista 64 cd is an oem version I forgot to pack with me, so I'm not sure how I'm going to get around this.
If it doesn't recognize the HD as a proper boot device, then that is the exact message it will display. However, if you want reassurance, unplug the optical drives or disable them in the bios. Then boot and see if you get the same message.
It should still attempt to boot and then hang if the mobo drivers are too different, not skip the drive altogether.
A little side note, my P35-DQ6 took a dump so I installed a P45-UD3R. I had W7 on an old PATA drive and it booted up and then reloaded all the drivers for the new chipset. It took about 5 minutes and 1-2 reboots and it was all fresh for the new mobo.
I just swapped out a BIOSTAR MoBo that died with a new Gigabyte MoBo and EVERYTHING loaded as if i didnt even swap the motherboards... next suggestion is to just burn an image of Vista and use it to "repair the OS"