Can't boot into safe mode in macOS El Capitan on 2013 Mac Pro

[Royyo]

Hello,
Can't boot into safe mode, can't option boot to choose startup drive. Changed keyboard (both Apple) no joy. Screen stays black with no noise from hard drive. Have zapped PRAM and reset SMC, run Disk Utility, DiskWarrior etc. Can boot into recovery. Can anybody here suggest a course of action?
Thanks.

 

[chrfr]

Hello,
Can't boot into safe mode, can't option boot to choose startup drive. Changed keyboard (both Apple) no joy. Screen stays black with no noise from hard drive. Have zapped PRAM and reset SMC, run Disk Utility, DiskWarrior etc. Can boot into recovery. Can anybody here suggest a course of action?
Thanks.

Do you have a firmware password enabled?

 

[Royyo]

Do you have a firmware password enabled?

I checked, I don't.

 

[Royyo]

And my mistake; it's a 2008 Mac Pro.

 

[BrianBaughn]

Wired keyboards?

 

[Royyo]

Yes, I have two wired Apple keyboards. Neither of them recognise the commands.

 

[BrianBaughn]

By "run Disk Utility" you mean First Aid via Disk Utility? If not, do that.

 

[Royyo]

Yes, done that.

 

[chrfr]

If you can boot to recovery you have access to a startup disk setting from the Apple menu there. What are your options there? Could it be that you've installed a GPU that doesn't have drivers in El Capitan?

 

[Royyo]

I can choose my startup disk from the control panel so there's no problem there. I have a AMD FirePro D300 2 GB. Is that compatible?