Legacy PC, OC not booting

Hi guys. I just want to say that I've just figured out that, v3 High Sierra dmg file had clover installation, not opencore. (In my other post, i thought it was also OC) And now I'm trying opencore's guide but can't boot it. After i picked the usb, get a long dark screen, waiting, then i get a gray screen which looks like a BIOS, only says continue, boot manager and 2 things more, not opencore screen. Can't see opencore no matter what i try. Any suggestions? Thanks!

submitted by /u/dogukan55209
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