Macbook stuck in a loop during install of Mojave from Sierra

When i use disk utility i can see my hard drive volume and everything is there. I just need to get to it somehow. I also have the disk images OS X Base System which is what is booting from (?) and am unable to eject it

Ok ive tried that but then when it loads it then goes to try to install again. Seems i cannot get out of this loop. The drive is all there intact, as i have viewed it in disk utility, just can't get to it

Are these pictures helpful? Did you need to see the actual error log from the (attempted) installation?

In the meantime just checking some other options online...

Worst case scenario:

If it is possible to take some files (music, pics, etc) off this harddrive then I don't mind to wipe the disc. I have not had this computer for a super long time so is not too much trouble as long as I don't loose certain data. I have an external caddy. I hope I can access the files.

Cool. I do have an external hard drive with stuff on it. Can I use that with something?

I also have another internal HD and I have a caddy to connect via USB. This internal drive needs reformatting I think...Or I can install it into the broken mac and boot it up then connect the bad drive via the caddy? Thanks for the help and sorry if I am a bit all over the place ;)

The error log is very long and am unable to save it. Though could take some pics of it i guess.

I need to locate some tools to do the hdd thing so will try that tomorrow. It is getting late here. Thanks for the help so far, is appreciated

Hi just an update on this problem. I moved house after i posted discussion and have only just got internet again. Am still trying to solve the problem.

So, once my external hard drive is plugged in what do i do? I never got any further.

Also, i am willing to wipe my HDD and reinstall fresh but not sure this approach will do anything. Thanks if you can help

Henry

Basically the problem is i cannot get rid of this OSX Base System. I cannot eject it , i cannot get past it. Am forever stuck in this loop. If i buy another internal HDD will i be able to use this conputer again?

Hi thanks so much for the quick reply yesterday eve. I had to dash out so only just can reply. Will be online for a while now this eve to do stuff. I have now booted up in recovery mode. I have my external drive plugged into mac and is showing up. If i will wish to install Mac OS on this drive will it not delete stuff?