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Pc tries to start then stops


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8 replies to this topic

#1 Manshead

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Posted 15 March 2014 - 07:43 AM

I'm trying to repair a friends pc. When you turn it on the CPU fan starts to turn for about 15 seconds and then the whole thing shuts down. I thought it might be the PSU but all voltages seem ok.

Hope someone can help.


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#2 dicke

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Posted 15 March 2014 - 12:34 PM

Hi,

What were the indications that they computer needed repair before you started? It almost sounds like the BIOS isn't providing the necessary commands for the system to continue.

Keep us posted


Stay well and surf safe [stay protected]

Dick E


#3 mjd420nova

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Posted 15 March 2014 - 01:24 PM

The PS is failing, checking voltages  AFTER the shutdown will tell you which one has failed, 12 volt or 5 volt.  The maximum load will come right about that time during a boot process and it can't maintain so it shuts down.



#4 Manshead

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Posted 15 March 2014 - 05:07 PM

Thanks for the replies. If I understand correctly, when the PSU is not under load it will show correct voltages .But under max load it will falter.


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#5 dicke

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Posted 15 March 2014 - 07:18 PM

That's the way it works :thumbup2: 


Stay well and surf safe [stay protected]

Dick E


#6 Manshead

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Posted 16 March 2014 - 06:36 AM

Hi,

What were the indications that they computer needed repair before you started? It almost sounds like the BIOS isn't providing the necessary commands for the system to continue.

Keep us posted

He says the Pc just wouldn't start.

I used the PSU from my PC to cancel malfunction issues. Now it seems to be in an endless cycle of the fan coming on for maybe 25 secs then turning off and back on again. All I have connected to the MB is the 4 square plug which I thinks for the CPU and the Large block connector. Is this ok just to check the computer.


Handle every situation like a real man.
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Walk Away, it Aint worth the hassle.

#7 billman87

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Posted 16 March 2014 - 07:30 AM

15 seconds is a fairly long time you should be seeing the BIOS by then and not likely to be a short circuit.

I would remove the mainboard from the case and do a physical inspection. Look for enlarged caps or damaged tracks.

Remove all add ons like VGA card, RAM and HDD's, make the load as light as possible.

Once RAM is removed the board should* produce a beeping sound to indicate RAM failure. If so then CPU/MOBO are working.

If you don't get any beep response without RAM then it PSU, CPU or mainboard failure.

 

Also listing your hardware, including PSU wattage age of PC and last the last time it was working provides us insight to your issue.

 

Randomly I know of some (older) boards exhibit this if the fail to detect a CPU fan but without knowing the specifics it only speculation.



#8 Manshead

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Posted 18 March 2014 - 06:10 AM

Thanks for your replies.
I'm not sure if this is significant when I leave the four square pin for the CPU power off the PC doesn't power off. It keeps running but will not boot. Could this mean the CPU's at fault causing the continuous rebooting cycle.
Handle every situation like a real man.
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#9 dicke

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Posted 18 March 2014 - 06:43 AM

Hi,

Sounds reasonable. Might be something in the motherboard as opposed to the CPU itself.

Keep us posted


Stay well and surf safe [stay protected]

Dick E





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