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<blockquote data-quote="Randy B. Singer" data-source="post: 1858353" data-attributes="member: 190607">Things that can cause this:- Bad power supply- Cold solder joint (this often mimics a bad power supply, but can be fixed with just the touch of a soldering pen)- Overheating (often due to Mac being filled with fluffy dirt and needing to be vacuumed out, sometimes due to failing or failed fans)- Large current draw on circuit (often due to a huge load cycling on, like a laser printer, air conditioner, or a refrigerator)I've seen all of these.&nbsp; The most common being a cold solder joint.&nbsp; You can usually see one solder point on the motherboard that is black, and if you run your fingernail over it you can feel a crack.&nbsp; It's usually a solder joint holding in the power supply, so shops usually charge you to replace an entire power supply when it isn't needed, but that does solve the problem.&nbsp; DO NOT check this yourself.&nbsp; The power supply, even when your Mac is unplugged, holds enough of a charge to kill you!It's best to go to a good repair shop that boasts that it will do &quot;component level repairs.&quot;&nbsp; i.e. they don't just replace entire boards, they actually replace just the (inexpensive) component that is bad.</blockquote>

[QUOTE="Randy B. Singer, post: 1858353, member: 190607"] Things that can cause this: - Bad power supply - Cold solder joint (this often mimics a bad power supply, but can be fixed with just the touch of a soldering pen) - Overheating (often due to Mac being filled with fluffy dirt and needing to be vacuumed out, sometimes due to failing or failed fans) - Large current draw on circuit (often due to a huge load cycling on, like a laser printer, air conditioner, or a refrigerator) I've seen all of these. The most common being a cold solder joint. You can usually see one solder point on the motherboard that is black, and if you run your fingernail over it you can feel a crack. It's usually a solder joint holding in the power supply, so shops usually charge you to replace an entire power supply when it isn't needed, but that does solve the problem. DO NOT check this yourself. The power supply, even when your Mac is unplugged, holds enough of a charge to kill you! It's best to go to a good repair shop that boasts that it will do "component level repairs." i.e. they don't just replace entire boards, they actually replace just the (inexpensive) component that is bad. [/QUOTE]

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