problem starting iMac (grey screen and an unknown bar)
when i press the start button, it display an apple logo at the center (is normal) . but after a while it downsite display a bar like downloading, installing, updating something. after that it automatically turn off itself. then i turn on it again, it do the same thing. i have try to turn on it many times, but it same.how can it be??? i have no idea to fix this problem. who can help me???
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