I'm dealing with a weird issue and I really need some help. I have two SSD drives connected to an ASUS MAXIMUS RANGER VII motherboard. In one SSD I'm using Windows 8.1 Pro x64, on the other SSD I have openSuse x64.
I don't have dual-boot enabled so when I want to swicth between them I just use the boot menu and select which drive to boot.
The problem is that whenever I try to boot Linux (after using Windows) I get a black screen. No BIOS POST, no boot selection, nothing. DEL key or F8 key does nothing.
I get POST only when I disconnect both SSDs and do a reboot. Only then I can boot to Linux. I only get the back screen when trying to switch from one device to the other.
What I've tried so far:
- switched monitor from dedicated graphics card output to onboard card output
- disconnected all usb devices from motherboard
- enabled/disabled onboard graphics card
- switch SSDs to different SATA ports
The BIOS has enabled CSM with Secure Boot. And I'm using the latest BIOS version.