IR disappears on my Mac Mini

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i'm having strangest thing happen on mac mini (mid 2011).

it's worth, i've upgraded yosemite.

while back, noticed mini wasn't responding ir commands. went check in security & privacy menu under advanced, , sure enough, there no option available disable ir. based on i've read online, means somehow mini has lost ability receive ir signals.

decided try clean install of yosemite bootable usb have, couldn't mini restart while holding down option key.

best mini restart while holding down command + r. via method, apple verified machine, , able download , reinstall yosemite. sure enough, once yosemite reinstalled, mini once again able receive ir codes.

use mini htpc, leave running. however, when restart, lose ir functionality, , looking again in security & privacy, see i've lost mention of ir once again. reinstall yosemite (via command + r, not via option key @ startup), , ir reappears.

restarted computer update, , i've lost ir functionality again. i've gone through sequence 3-4 times, i'm pretty tired of reinstalling yosemite, thought i'd check , see if might have better solution?

yosemite doesn't me on machine, i'd happy reinstall mountain lion (i have bootable usb), can't restart mini when holding down option key, can't this.

might have ideas?
 

if have third party ssd in there, you'll have problems yosemite.
 


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