Is this a UEFI machine or the old BIOS. This is important to know. If a new machine it is probably UEFI but if it is a couple of years old most likely BIOS
So do you see anything during the boot like the grub menu? ie at waht point do you get the blank screen. This could be a video problem but we would need more info to figure that out. All our crystal balls are broken and only you can tell use what you see and what you have.
It’s a BIOS. I see no grub menu at all. Just the regular motherboard bootup screen and then black screen with the blinking cursor. (sorry, I thought that was clear)
Using the sda hdd as first boot, I boot into opensuse no problem (see second post), so it’s not a video problem.
I ran the boot loader setup once in there and tried installing it onto /dev/sdb. Got no errors but still unable to boot from second hdd.
Sorry, but I can not understand the sentence I quoted (and I hate rough ooutlines, they allways lead to misunderstandings)). And thus stopped reading there and tried to get more clarification. When you think it is of no importance, then we leave it at that.
At this point I’m willing to give up on this. /boot is on the SSD drive (sdb) so it still be technically taking advantage of the improved speed.
Yes, the initial boot happens from the other harddrive but whatever.
It’s more of a curiosity/principle thing. I just don’t see why it wouldn’t boot off of sdb.
As for installation - if you used the same selection (i.e. MBR), you let yast select actual disk. And it is most probably will be sda indeed. To be sure bootloader is installed on /dev/sdb you need to uncheck everything except custom and select custom location /dev/sdb.