My laptop is displaying an error message, "No bootable device - insert boot disk and press any key"?

I have a Aspire One D255.and this error message keeps popping up and it makes this beeping noise, It doesn't let me go past it, Is there anyway to get rid of it or fix it?
Update: its a mini laptop so there is no dvd/cd rom on it, so I'm not sure how I would insert a disc into it
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