HT204267: If your Mac won't turn on
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Q: my computer (macbook pro, yosemite) went black when my son was running a connectivity speed test and download speed test to take o ... my computer (macbook pro, yosemite) went black when my son was running a connectivity speed test and download speed test to take online class exam. He said it was making a 3 beep alarm and was unable to bring up screen again. more