Startup goes to black screen saying no system found.

[macasnak]

After installing an Ubuntu system to USB stick, it appears some boot loader has been placed on my Mac.

Goes to black screen, says cannot find system. When select the usual drive by holding option key at start, it still goes to a blank screen.

I have looked at the drives on system using disk utility, and there is an ‘AppleAPFSMedia’ showing up, with my usual drive name attached to it, and PreBoot, Recovery, VM.

It looks like the Hardware Drive shows up. Yet the drive name I gave it has been removed from it, and placed under the AppleAPFSMedia.

Please advise on how to resovle issue and get back to normal system.
[doublepost=1534023588][/doublepost]Disk Utility Image...

 

[TimothyR734]

hold the option key down while booting it should show the drives you can boot from

 

[macasnak]

hold the option key down while booting it should show the drives you can boot from

I have tried that, yet still goes to blank screen saying no system found. It appears that the usual drive has been mapped elsewhere due to new bootloader?... Please see image. The OCZ SSD hardware should have the name '240GB Int' under it, has been moved onto the AppleAPFS...