Hello , My mac mini won't let a new disc be inserted into the optical drive. It's like the sensor or feed motors aren't working. We know there is no disc in there. Someone said i could try resetting the BIOS for the optical drive - but i don't know how to do that. I've tried rebooting (which we think used to help but doesn't now) and cleaning out dust with a vacuum.. Any help would be much appreciated 
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