Mac开机黑屏解决办法
开机黑屏问题
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h6 tt, h6 code { font-size: inherit }
h1 { font-size: 28px; color: rgba(0, 0, 0, 1) }
h2 { font-size: 24px; border-bottom: 1px solid rgba(204, 204, 204, 1); color: rgba(0, 0, 0, 1) }
h3 { font-size: 18px }
h4 { font-size: 16px }
h5 { font-size: 14px }
h6 { color: rgba(119, 119, 119, 1); font-size: 14px }
p, blockquote, ul, ol, dl, li, table, pre { margin: 15px 0 }
hr { background: url(“data:image/png;base64,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”) left top repeat-x rgba(0, 0, 0, 0); border: 0 none; color: rgba(204, 204, 204, 1); height: 4px; padding: 0 }
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body>h1:first-child+h2 { margin-top: 0; padding-top: 0 }
body>h3:first-child, body>h4:first-child, body>h5:first-child, body>h6:first-child { margin-top: 0; padding-top: 0 }
a:first-child h1, a:first-child h2, a:first-child h3, a:first-child h4, a:first-child h5, a:first-child h6 { margin-top: 0; padding-top: 0 }
h1 p, h2 p, h3 p, h4 p, h5 p, h6 p { margin-top: 0 }
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li { margin: 0 }
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dl dt:first-child { padding: 0 }
dl dt>:first-child { margin-top: 0 }
dl dt>:last-child { margin-bottom: 0 }
dl dd { margin: 0 0 15px; padding: 0 15px }
dl dd>:first-child { margin-top: 0 }
dl dd>:last-child { margin-bottom: 0 }
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blockquote>:first-child { margin-top: 0 }
blockquote>:last-child { margin-bottom: 0 }
table { padding: 0; border-collapse: collapse }
table tr { border-top: 1px solid rgba(204, 204, 204, 1); background-color: rgba(255, 255, 255, 1); margin: 0; padding: 0 }
table tr:nth-child(2n) { background-color: rgba(248, 248, 248, 1) }
table tr th { font-weight: bold; border: 1px solid rgba(204, 204, 204, 1); margin: 0; padding: 6px 13px }
table tr td { border: 1px solid rgba(204, 204, 204, 1); margin: 0; padding: 6px 13px }
table tr th :first-child, table tr td :first-child { margin-top: 0 }
table tr th :last-child, table tr td :last-child { margin-bottom: 0 }
img { max-width: 100% }
span.frame { display: block; overflow: hidden }
span.frame>span { border: 1px solid rgba(221, 221, 221, 1); display: block; float: left; overflow: hidden; margin: 13px 0 0; padding: 7px; width: auto }
span.frame span img { display: block; float: left }
span.frame span span { clear: both; color: rgba(51, 51, 51, 1); display: block; padding: 5px 0 0 }
span.align-center { display: block; overflow: hidden; clear: both }
span.align-center>span { display: block; overflow: hidden; margin: 13px auto 0; text-align: center }
span.align-center span img { margin: 0 auto; text-align: center }
span.align-right { display: block; overflow: hidden; clear: both }
span.align-right>span { display: block; overflow: hidden; margin: 13px 0 0; text-align: right }
span.align-right span img { margin: 0; text-align: right }
span.float-left { display: block; margin-right: 13px; overflow: hidden; float: left }
span.float-left span { margin: 13px 0 0 }
span.float-right { display: block; margin-left: 13px; overflow: hidden; float: right }
span.float-right>span { display: block; overflow: hidden; margin: 13px auto 0; text-align: right }
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sup { font-size: 0.83em; vertical-align: super; line-height: 0 }
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@media screen and (min-width: 914px) { body { width: 854px; margin: 0 auto } }
@media print { table, pre { page-break-inside: avoid } pre { word-wrap: break-word } }
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.token.operator, .token.entity, .token.url { color: rgba(103, 205, 204, 1) }
.token.important, .token.bold { font-weight: bold }
.token.italic { font-style: italic }
.token.entity { cursor: help }
.token.inserted { color: rgba(0, 128, 0, 1) }
pre.line-numbers { position: relative; padding-left: 3.8em; counter-reset: linenumber 0 }
pre.line-numbers>code { position: relative }
.line-numbers .line-numbers-rows { position: absolute; pointer-events: none; top: 0; font-size: 100%; left: -3.8em; width: 3em; letter-spacing: -1px; border-right: 1px solid rgba(153, 153, 153, 1); -webkit-user-select: none; -moz-user-select: none; -ms-user-select: none; user-select: none }
.line-numbers-rows>span { pointer-events: none; display: block; counter-increment: linenumber 1 }
.line-numbers-rows>span:before { content: counter(linenumber); color: rgba(153, 153, 153, 1); display: block; padding-right: 0.8em; text-align: right }
Mac book Pro 很容易懒得关机，从年前到现在差不多两个月了没关机，还开一堆程序，今天关完机，这货居然开不了机了，很郁闷。
故障现象：
1. 开机有声音
2. 背面logo灯亮
3. 键盘背光灯不亮
4. 大写锁定键灯按下不亮
5. 屏幕有背光，无苹果logo，黑屏解决办法：重置PRAM后成功开机
重置 PRAM (parameter RAM) 操作步骤：
1. 关闭 Mac
2. 在键盘上同时按下：Command(⌘)、Option、P 和 R
3. 启动 Mac
4. 出现灰屏前一直按住步骤2指定的键
5. 直到电脑重新启动，您会再次听到启动声
6. 松开这些键即可如果上面的步骤已经可以开机，下面的就不用试了
重置 SMC/重置系统管理控制器步骤:
1. 关闭电脑
2. 将 MagSafe 电源适配器连接到电源和 Mac(如果未连接的话)
3. 在内建键盘上，同时按下 Shfit(左侧) + Control + Option键和电源按钮
4. 同时松开所有键和电源按钮
5. 按下电源按钮打开电脑
==注：重置SMC时，MagSafe 电源适配器上的 LED 指示灯可能会更改状态或暂时关闭 ==