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Power supply question


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#1 bob8823

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Posted 20 July 2014 - 11:43 AM

How do I tell if my power supply has gone bad.  Tried to boot up this morning and nothing but a black screen.  I can hear the fans in the case running, but the fan in the power supply itself is not running and the top of the computer was pretty warm.

Appreciate any help, thanks.

 

Bob

 



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#2 wpgwpg

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Posted 20 July 2014 - 12:17 PM

 Can you boot to Safe Mode?  How old is your power supply?  Power supplies do degrade over time.


Everyone with a computer should back his system up to an external hard drive regularly.  :thumbsup:

#3 bob8823

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Posted 20 July 2014 - 01:20 PM

 Can you boot to Safe Mode?  How old is your power supply?  Power supplies do degrade over time.

No, won't do anything.  It's an old computer, I use it out in my shop so I'm not surprised something went bad, just trying to determine if that's all that's wrong with it.  I'd hate to buy another power supply and find out something else is bad also.



#4 JohnC_21

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Posted 20 July 2014 - 01:41 PM

You can check the PSU with a multimeter but it's not perfect as the best way to check it is if it is under load. Always ground yourself first before trying to remove any cables. See this video. Have a PSU with no fan running will cause the computer to overheat. That fact alone tells me the PSU is probably bad.

https://www.youtube.com/watch?v=ac7YMUcMjbw


#5 bob8823

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Posted 20 July 2014 - 01:43 PM

 

You can check the PSU with a multimeter but it's not perfect as the best way to check it is if it is under load. Always ground yourself first before trying to remove any cables. See this video. Have a PSU with no fan running will cause the computer to overheat. That fact alone tells me the PSU is probably bad.

https://www.youtube.com/watch?v=ac7YMUcMjbw

Link won't work



#6 wpgwpg

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Posted 20 July 2014 - 01:59 PM

 You can get a cheap desktop power supply for as little as $15.  If you think it's time to buy a new computer, I see desktops as cheap as $229.

 

Good luck.


Everyone with a computer should back his system up to an external hard drive regularly.  :thumbsup:

#7 JohnC_21

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Posted 20 July 2014 - 03:42 PM

Hmm, it works for me. Here it is.

 



#8 bob8823

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Posted 20 July 2014 - 03:57 PM

Hmm, it works for me. Here it is.

 

Thanks.



#9 OldPhil

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Posted 20 July 2014 - 04:47 PM

If the PSU fan is not running it will get very hot if left on.


If you don't stand for the flag then you will fall for anything!


#10 jonuk76

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Posted 20 July 2014 - 05:40 PM

 

You can check the PSU with a multimeter but it's not perfect as the best way to check it is if it is under load.

 

You could connect the multimeter to a spare Molex plug without removing and disconnecting the PSU from the PC as shown in the video.  This will at least allow you to test 12v and 5v while the PC is running.

 

Also things like this are available to simplify testing - http://www.thermaltake.com/products-model.aspx?id=C_00001777


Edited by jonuk76, 20 July 2014 - 05:40 PM.

7sbvuf-6.png


#11 bob8823

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Posted 20 July 2014 - 05:45 PM

 

 

You can check the PSU with a multimeter but it's not perfect as the best way to check it is if it is under load.

 

You could connect the multimeter to a spare Molex plug without removing and disconnecting the PSU from the PC as shown in the video.  This will at least allow you to test 12v and 5v while the PC is running.

 

Also things like this are available to simplify testing - http://www.thermaltake.com/products-model.aspx?id=C_00001777

 

Not a computer guy so would'nt even know how to do that.  I don't mind buying a power supply if I'm sure this one is bad.  The fan doesn't run and the power supply was very hot this morning when I went to use the computer.



#12 Ezzah

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Posted 20 July 2014 - 08:05 PM

If fan ain't running, PSU is dead. It's safe to assume that. :) It's possible for a dead fan, but unlikely. Since its old, go for an upgrade.


Edited by Ezzah, 20 July 2014 - 08:06 PM.

mYIGVc5.png


#13 OldPhil

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Posted 20 July 2014 - 08:30 PM

Now is the time to contemplate the next move, good chance for you to think about a newer quicker machine.  Some cheap stuff on Ebay, buy from guys with 99+ ratings.


If you don't stand for the flag then you will fall for anything!


#14 bob8823

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Posted 20 July 2014 - 09:28 PM

Now is the time to contemplate the next move, good chance for you to think about a newer quicker machine.  Some cheap stuff on Ebay, buy from guys with 99+ ratings.

Thanks for all the help guys, I appreciate it.  I have a new computer in my office, this is my old computer that I use in my shop.  I don't really need it but it is nice to have when I do.  I found a power supply for $25, so I'm going to get that and hope it solves the problem, if not I'll just have to use my laptop in the shop when I need it.  Thanks again for all the help.

 

Bob






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