crwdns2934241:0crwdne2934241:0 Cooper Zen

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It will turn on but no post on screen need help

crwdns2934249:0crwdne2934249:0:

I just bought this off Facebook marketplace he said it needs os but im not sure i have the disk for it but nothing works on the keyboard to open the disk drive im not sure what to do

crwdns2866306:0crwdne2866306:0:

Mac Pro First Generation

crwdns2915684:0crwdne2915684:0:

open