I ve 5.1 speakers need to repurpose it for pc via amp for surround sound.?

Amp is a bit old has VDP, tuner, CD inputs only. I ve hooked up the speakers. Once I plug the output from pc it will ask whether front, rear or center but I could connect only 1 input to amplifier. Because of this it works as stereo but I was wondering whether it is possible to get surround sound?
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