Most likely you have a temp issue. Have you opened the system up and cleaned it yet? I would start there.
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I would also recommend you install a sensor monitoring app like this one: [https://www.tunabellysoftware.com/tgpro|TG Pro]. If you buy the full version it will log the fans & temps upto the point of the system shutting down. So you can see if that is the issue. Paste a screen shot of the TG Pro console so we can see as well.
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I would also recommend you install a sensor monitoring app like this one: [https://www.tunabellysoftware.com/tgpro|TG Pro]. If you buy the full version it will log the fans & temps upto the point of the system shutting down. So you can see if that is the issue. Paste a screen shot of the TG Pro console so we can see as well.
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=== Update (02/19/2016) ===
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If the system looks clean and the sensors all look good, it's starting to sound like a power supply problem.
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What does the diagnostic LED's doing? Now that you have the display off.
Most likely you have a temp issue. Have you opene the system up and cleaned it yet? I would start there. I would also recommend you install a sensor monitoring app like this one: [https://www.tunabellysoftware.com/tgpro|TG Pro]. If you buy the full version it will log the fans & temps upto the point of the system shutting down. So you can see if that is the issue. Paste a screen shot of the TG Pro console so we can see as well.
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Most likely you have a temp issue. Have you opened the system up and cleaned it yet? I would start there.
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I would also recommend you install a sensor monitoring app like this one: [https://www.tunabellysoftware.com/tgpro|TG Pro]. If you buy the full version it will log the fans & temps upto the point of the system shutting down. So you can see if that is the issue. Paste a screen shot of the TG Pro console so we can see as well.
Most likely you have a temp issue. Have you opene the system up and cleaned it yet? I would start there. I would also recommend you install a sensor monitoring app like this one: [https://www.tunabellysoftware.com/tgpro|TG Pro]. If you buy the full version it will log the fans & temps upto the point of the system shutting down. So you can see if that is the issue. Paste a screen shot of the TG Pro console so we can see as well.