dual boot - Unable to install ubuntu alongside windows 10 on separate disk

I have a system with three drives, one ntfs boot ssd for windows 10, one ntfs hdd for storage, and another to install ubuntu on.

I am getting the

Force UEFI Installation? This machines's firmware has started this installer in UEFI mode but it looks like there maybe existing operating systems already installed using BIOS compatibility mode, If you continue to install Debian in UEFI mode,it might be difficult to reboot into any BIOS-mode operating system.

Message, so I tried both booting from the live usb in non uefi (doesn't boot at all, just goes straight to windows), and installing by forcing uefi - this installs successfully, but will not boot, even with the other drives disconnected.

The motherboard in use is an Asus P8Z77-V, and as many 'fast-boot' settings as I can find are turned off.

parted -l:

Model: ATA WDC WD10EZEX-00W (scsi)
Disk /dev/sda: 1000GB
Sector size (logical/physical): 512B/4096B
Partition Table: msdos
Disk Flags: 

Number  Start   End     Size    Type     File system  Flags

 1      1049kB  525MB   524MB   primary  ntfs         boot
 2      525MB   1000GB  1000GB  primary  ntfs


Model: ATA KINGSTON SUV400S (scsi)
Disk /dev/sdb: 120GB
Sector size (logical/physical): 512B/4096B
Partition Table: msdos
Disk Flags: 


Number  Start   End    Size   Type     File system  Flags
1      1049kB  120GB  120GB  primary  ntfs


Model: ATA WDC WD3200AAKS-0 (scsi)
Disk /dev/sdc: 320GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 


Number  Start   End    Size    File system     Name                  Flags
1      1049kB  538MB  537MB   fat32           EFI System Partition  boot, esp
2      538MB   312GB  311GB   ext4
3      312GB   320GB  8455MB  linux-swap(v1)