cant get my msi Tomohawk Z270 motherboard to post

Aug 11, 2018
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i have a 450w crosair PSU, a gigabyte GTX 1060 3gb GPU, a intel core i3 8100, 2x 4gb Hyper x RAM, a 1TB HDD

but whenever i put the parts together it doesn't post i do have 2 M.2 SSD slots on my board but i dont have a M.2 SSD and i have followed all instructions in the manual but to no success was wondering if it was due to not having a M.2 SSD or something else all tougther?
any help would be largely appreciated