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Computer turns on then off then on then off etc


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#1 FreeMountain

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Posted 25 May 2018 - 07:18 AM

Hello! 
When my computer froze today, I just walked away and when I came back the computer had shut down. I was surprised and tried to turn it on, when I turned it on everything started, all light, all fans etc. But after about 2 sec, the computer shuts down, all the fans and LED etc shuts down, but then again without turning it on the computer turns on itself again and then off, exactly what happened the first time. the computer tries to turn on then off and just keep doing that unless I cut the power. It seems that the PSU is trying to get enough power to start, then it can't but then it tries again. But I have no idea, thats just me thought, I appreciate if you would help. :) 


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#2 mikey11

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Posted 25 May 2018 - 07:19 AM

probably overheating......or faulty power supply unit



#3 FreeMountain

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Posted 25 May 2018 - 07:20 AM

how do I fix it?


Edited by hamluis, 28 May 2018 - 04:37 PM.


#4 mikey11

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Posted 25 May 2018 - 07:25 AM

is it desktop or laptop?



#5 FreeMountain

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Posted 25 May 2018 - 07:29 AM

d

desktop


Edited by hamluis, 28 May 2018 - 04:37 PM.


#6 mikey11

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Posted 25 May 2018 - 07:30 AM

i would start by opening it up and cleaning the dust from the CPU fan and heat sink assembly.....if you think you are capable it is best to remove the fan to do this



#7 FreeMountain

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Posted 25 May 2018 - 07:38 AM

okay, you mean remove the cpu fan? Thanks mate


Edited by hamluis, 28 May 2018 - 04:36 PM.


#8 mikey11

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Posted 25 May 2018 - 08:01 AM

yes


Edited by hamluis, 28 May 2018 - 04:36 PM.


#9 FreeMountain

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Posted 25 May 2018 - 08:19 AM

UPDATE: Solved the problem by cleaning everything. 

 

QUESTION: Why would dust make the computer unbootable?

 

Thank a lot for the help mate


Edited by hamluis, 28 May 2018 - 04:35 PM.


#10 mikey11

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Posted 25 May 2018 - 11:29 AM

the computer is overheating so it turns itself off to prevent damage,

 

the dust affects the airflow, less airflow means less cooling


Edited by mikey11, 25 May 2018 - 11:30 AM.


#11 Bushtuckaman

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Posted 19 June 2018 - 06:49 AM

Im having the same problem as the original poster.  PC is switching off after a period of use, then restarts immediately, and then goes into a constant cycle of switching off then restart.
 
I have given it a good clean out inside but its not solved the problem.
 
I think the problem is related to overheating, as the problem ocurred more quickly when the room temperature is high. On cold days you can use the PC for a hour or more before the problem arises.  In the summer it less that 5 minutes.
 
The PC has a overclocked processor and i was wondering if this is part of the issue and if i could reduce the clock speed to aleviate the problem. I don't know what settings in the bios need changing to do this though.

 

Attached  is an image of the PC spec

 

Also I have Speedfan program data included in the image showing hardware operating temperatures.  The System and CPU temperatures get to 50-55C and this is when the restart problem occures.

 

Any help or advice would be greatly appreciate.

 

Cheers

John

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