Same happening to me. I am able to install mojave but there's no support for GTX 1060 so I try to nstall High Sierra and negation symbol appears after 30 seconds of apple logo. Even If I was able to install mojave with all my HHD on I followed the instractions and I left only the instalation...
and 2 years after...yeah..got the same problem my os x installer can't detect any hdd in hard disk utility. Also the Opti. 755 has problems to install other HDD than the original. I migth take it outside for council clean up collection and get a more compatible pc?
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