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Computer won't start sometimes


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#1
jds63

jds63

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O.k. this problem happened not too long after using a air duster cleaner to clean inside computer to remove dust,i have done this plenty of times before,the day i did this the computer didn't turn on at all,when i pressed power button,nothing at all,but after about an hour or so later,it turned on,since that time no problems.Recently same issue has come up again if i shutdown computer it won't start up,no fans,no lights,nothing.I have checked the power cord,with a multimeter it is getting power,so is the monitor and everything else on power surge protector.What happens it takes numerous times till it finally starts up again,when it does,everything works fine no errors,nothing,runs good.If i shut it down,have same issue getting it going again,take many times to start it by pressing power button.My searching for explanation to this problem either points to power supply or motherboard.Now if it is the motherboard,why would it run flawless,when it finally gets started? To me seems like a failing PSU,but i do not want to buy one,try this,till i can know,what it can be,any answers or help,much appreciated.The system is around 7 yrs. old here are specs.

MS Windows 7 Home Premium 32-bit SP1
CPU
AMD Athlon 64 X2 5000+ 52 °C
Brisbane 65nm Technology
RAM
4.00 GB Dual-Channel DDR2 @ 326MHz (5-5-5-15)
Motherboard
ELITEGROUP MCP61PM-AM (Socket AM2 ) 40 °C
Graphics
ASUS VS229 (1920x1080@60Hz)
NVIDIA GeForce GT 610
Hard Drives
488GB Western Digital WDC WD50 00AAKS-00TMA SCSI Disk Device (ATA)
Optical Drives
HL-DT-ST DVDRAM GSA-H40N ATA Device
Audio
Creative X-Fi Audio Processor (WDM)
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#2
phillpower2

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Hello jds63

Can you provide the PSU brand and model name or number please.

Download Speedfan and install it. Once it's installed, run the program and post here the information it shows. The information I want you to post is the stuff that is circled in the example picture I have attached.
If you are running on a vista machine, please go to where you installed the program and run the program as administrator.

Posted Image
(this is a screenshot from a vista machine)

To capture and post a screenshot;

Click on the ALT key + PRT SCR key..its on the top row..right hand side..now click on start...all programs...accessories...paint....left click in the white area ...press CTRL + V...click on file...click on save...save it to your desktop...name it something related to the screen your capturing... BE SURE TO SAVE IT AS A .JPG ...otherwise it may be to big to upload... then after typing in any response you have... click on browse...desktop...find the screenshot..select it and click on the upload button...then on the lower left...after it says upload successful...click on add reply like you normally would.

Depending on the results we may need to run further software for comparison.
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#3
jds63

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Hi Phillpower,ty for a response,here is the information u asked for,some say might be my power button,motherboard or PSU,so far,i have not shut down PC,afraid,never get it going,but it's been working fine,even restarted it no problems either.TY
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#4
phillpower2

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Hi jds63

Thanks for the screenshot :thumbsup:

The +3.3V and the +12V rails on your PSU are both showing as being lower than they should be, please see the .jpeg below which shows the max and min output required in order for the computer to function correctly, can you run HWMonitor for us and again provide us with a screenshot of the results for comparison http://www.cpuid.com.../hwmonitor.html
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#5
jds63

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Hi Phillpower,ty so far for your help,here is whatyou required from me
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#6
phillpower2

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Can you please rerun HWMonitor and expand the window to full screen before taking the screenshot as we cannot see all of the information that we need, from what we can see the +3.3V rail is again showing a low reading suggesting a bad PSU.
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#7
jds63

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Hi Phillpower,sorry about that,here it is oh,and my power supplies model is Delta 300PB3A

Edited by jds63, 28 October 2012 - 11:28 PM.

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#8
phillpower2

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With the repeated bad PSU readings I can only suggest that you try and borrow a known good PSU for testing purposes or have the present PSU tested by a tech store (some will do this for free) as this is the only way now to rule out a bad PSU other than purchasing a new one.
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#9
jds63

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Hi PhillPower,first off ty for your help.I have been doing some research myself on this,read some articles that told me this software used for PSU can sometimes give incorrect readings of a PSU.Although you may already know this,by telling me to have it checked by a tech at a place,to test it.I also did see stuff online how i can test it myself with a multimeter which would be more accurate then the software you made me use.I do not have anyone i can borrow a PSU from,but i am able find one online that will work for this PC.As i said before in my past posts,is there any chance could be the motherboard or power switch? I also know we are taking this step by step,rule out one thing at a time.Any more help is appreciated,otherwise we can close this topic.
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#10
phillpower2

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Hello jds63

You are correct in that the testing software is not always 100% accurate (Primarily Speedfan) and that is why we use comparison programs such as HWMonitor, Everest and Speccy, using a multimeter is not accurate either as specialist equipment is needed for this and what the equipment does is simulate a computer under load such as gaming or streaming videos, this causes the PSU to operate as if under those conditions meaning that a bad PSU will fail, please also see my canned text below;

As a PSU puts out various voltages +3.3V, +5V and +12V it may appear that the PSU is working correctly but it is not, any significant drop of any output can prevent the system from booting up, the other scenario is a significant increase in the output which can be worse as it can fry one or more major components such as the MB, CPU, Ram, add on video card etc.

Please be aware that there are no user replaceable parts in a PSU so a bad one should be disposed of in a responsible manner and any type of conclusive testing will need to be done by a suitably trained Tech who has the required testing equipment and the relevant knowledge as to how to use it.


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#11
jds63

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:thumbsup: Thank you dude working new power supply i took chance bought one did it myself installed :thumbsup:
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#12
phillpower2

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Thanks for the follow up jds63 :thumbsup:

Glad to hear that the issue is resolved and well done for swapping the PSU yourself and saving some cash in the process :D :spoton:
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#13
jds63

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Your Welcome,Thank you again, i am pretty knowledgeable done my own installing in past have been working with computers since late 1980's,but everday i learn something new if i do not i seek answers,Thank you again,close post. :thumbsup:
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