New PSU and my comp randomly shuts off -- please help a new builder

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boomstick1

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Jul 6, 2013
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Hi all,

I'm going for a silent build and a just installed my Seasonic 400w Fanless PSU.

First few hours worked great.

Then I leave for the bathroom and come back and the computer is mysterious turned off. I click the on button again and it boots for 5 seconds and then fails.

I've been assured by many that 400w is plenty for my i5-4670k and GTX 660 (no OCing, no SLI).

Should I RMA it? It's soooo crappy when you have to this with a PSU. I wonder if I can keep all the cables routed and just swap the PSUs. (yay for modular).

Also, if my comp randomly turns off, do I need to run some software diagnosis?
 
Solution
dish_moose
380 is very close to the max. Max does not mean sustained output - ratings decrease as temps increase. I like to double any power supply requirements I need - whether it is an electronic circuit I design or computer I build.
Edit - overkill yes - problems - NO.
Just think if you had to put out max effort - I think you would get very hot and then your output would go down. Can you monitor your psu temps?
-Bruce
BTW I am an electronic technologist - last 30 years.
You have to look at the derating curves for your psu to get a good grasp of how much wattage will be needed.
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boomstick1

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Jul 6, 2013
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My comp is now back and up in running. I smeleld the PSU and no hint of smoke or anything.

Should I RMA it? Should I not be running my comp right now? It would be tough not too...only device with internet in my house.
 
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boomstick1

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Jul 6, 2013
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Blackbird, you were the very person in the other thread of mine that said it would work, no problem at all. I can up the wattage, I guess.
 
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dish_moose

dish_moose

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Jul 7, 2010
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380 is very close to the max. Max does not mean sustained output - ratings decrease as temps increase. I like to double any power supply requirements I need - whether it is an electronic circuit I design or computer I build.
Edit - overkill yes - problems - NO.
Just think if you had to put out max effort - I think you would get very hot and then your output would go down. Can you monitor your psu temps?
-Bruce
BTW I am an electronic technologist - last 30 years.
You have to look at the derating curves for your psu to get a good grasp of how much wattage will be needed.
 
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