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my desktop pc doesnt turn on

hello experts.
My desktop pc suddenly does not turn on, i push the power button but nothing happens. But when i turn off and then turn on the power switch the computer starts automatically.

what went wrong??

thanks in advance!
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con13w
Asked:
con13w
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1 Solution
 
carboojaCommented:
If the computer turns on by using the power supply on off switch, then your board is fine.
Most likely your case button is broken and can be remedied by replacing the case.
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con13wAuthor Commented:
i don't use the power supply switch, I plug the power supply into the power cable and the computer starts automatically
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carboojaCommented:
Did you check to see if the power button is connected to the motherboard?
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con13wAuthor Commented:
yes everything is connected
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carboojaCommented:
and does the power button feel loose/broken?
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con13wAuthor Commented:
no ,as always
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blurSoulCommented:
Do this with the computer off but power connected.
Open the case, pull out the wire that links to the power button on the motherboard.
Use a jumper to short that 2 pins. does the computer turn on? If it does, the power button on the casing is spoilt.
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carboojaCommented:
So the computer boots fine into the operating system when you plug in the power cord, however it doesn't turn on when you push the power button correct?
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con13wAuthor Commented:
correct
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con13wAuthor Commented:
Sorry, i wrote a wrong scenario. To start my desktop pc, i have to unplug the power supply from the power cable and then  plug in the power supply into the power cable. after that when i pushing the power button everything works. if i don't do this scenario the power button doesn't work.
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carboojaCommented:
Okay,

That is completely different.

1. It could be a bad power supply, if the computer is more than 2-3 years old, that's the first thing I'd replace.
2. If that does not fix the issue, update your BIOS with the latest revision, and then go into the BIOS and set load defaults.
3. If that doesn't work, you may have a bad motherboard.
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con13wAuthor Commented:
is this problem serious? or i can leave my pc as it is?
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nobusCommented:
you should look into it, and repair it -it 'll only get worse.
look also for bad capacitors on mobo or in PS : swollen, or leaking ones as per www.badcaps.net
what pc is this?
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con13wAuthor Commented:
hello experts, I have changed my power supply and yet the same problem, some times my pc starts and some time doesn't. what can i do?  is there any way to turn on my pc without pushing the power button? (to see if the problem is on the power button)
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con13wAuthor Commented:
i got the pc the day before yesterday from the technician and he told me that the problem was on the power supply, I used the pc yesterday and suddenly today did not starts. I turn off the the power cable 2-3 times and try again, after 3 times the pc started!  
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nobusCommented:
it still looks like a mobo problem to me..
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nobusCommented:
you can try to reset the bios, or update it too - it can help in some cases
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con13wAuthor Commented:
how can i reset or update the bios? my motherboard is msi (ms-7185 ver 1.0 K8N SLI N1996)
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con13wAuthor Commented:
now sometimes i get blue screen on boot... would this be a problem in the ram?
pc-error.png
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nobusCommented:
how can it give a blue scren if nothing happens??  

the 9c error can point to ram problems, so test with 1 stick at the time
but also to other problems :  http://support.microsoft.com/kb/329284

you can use may article as a guide :  http://www.experts-exchange.com/articles/Hardware/Components/Motherboards/Short-overview-of-how-to-troubleshoot-bad-hardware-when-a-pc-does-not-post.htm
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nobusCommented:
to reset bios, remove AC cord and bios battery for a minute then test
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con13wAuthor Commented:
nobus, sometimes when i click the power button the computer starts and sometimes not. Now when it starts, a blue screen is showing up... I will try to change the ram (when i will find a DDR ram :( ) and reset the bios.. but thanks for the help.
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nobusCommented:
did you read the articles about the other possibilities also ?
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carboojaCommented:
Try to reseat the RAM first, also create a memory test CD from another machine.

The program can be found here

http://oca.microsoft.com/en/windiag.asp

You'll need 1 blank CD.
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faizbaigCommented:
Replace your motherboard, 100% Motherboard Problem.
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nobusCommented:
if you're in doubt, you can eliminate many parts by using the minimal setup as described in my article
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