[求救] imac螢幕似乎掛了，還有救嗎？
如題，剛剛把螢幕關了後再重啟，就變成了
全黑、出現來線條的狀況，今天是第二次發生
雖然他會突然又好，但是還是想詢問看看是否
大家有人知道這是什麼情形，謝謝。
實際情況
http://i.imgur.com/Rz7aHux.jpg
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