Zorin not loading to new computer

Situation. I built a computer using Tyan K7 thundr s2885 with dual opteron processors, 16 GB memory, H.I.S video card with radeon driver. Attempted to load zorin os into new computer. Oh, have 4 TB internal sata hd. Zorin wont load. Does not recognize hdd. Will only accept half the memory.
Need help.

Can you first have a look at this pre-installation advice: Before you install

Make sure you have verified the SHA256 checksum of downloaded .iso and have made changes to BIOS re Secure Boot, Fast Start and TPM.

Have you run the "Try ZorinOS" option from your Zorin USB and seen what it finds for Disk and Memory.