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PC wont turn on

Was on my computer the other day and stepped away for about 30 sec when I came back computer was off and now it will not turn back on. Cant figure out what happened. It is a computer I built it that makes any difference.

There is a light on the mother board so it is getting power and I even installed a new power supply to see it that was it with no results.
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1jaws
Asked:
1jaws
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18 Solutions
 
dbruntonCommented:
Disconnect all devices from motherboard except graphics cards.  This includes hard disks, CDROM drives, floppy drives, network connections, printers, USB devices, PCI cards,

See if it starts.  If it does then add devices back one at a time and test.

If it doesn't you've isolated it to motherboard.  Look at CPU fan and heatsink.  Check fan connections and dust in heatsink.  Also consider removing CPU and refreshing thermal paste.  Reseat CPU.
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austinstaceCommented:
Remove everything but the processor and 1 memory stick - all plug in cards, cd/dvd drives, hard drives and see if it comes on. If not, swap for a different mem stick. Still not, check your motherboard docs and clear the bios. Usually a jumper. If you don't have the docs, pull the cmos battery for a few minutes. If still nothing, you may have a bad motherboard. With everything removed, you should at least get through bios.

Another possibility is a shorted out power switch. Let me know what you get from the above.
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1jawsAuthor Commented:
OK I did as instructed and nothing happened. I can see a light on the mother board when power supply is on so I know it is getting some power, but when I go to turn on nothng.
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K_WilkeCommented:
look at every capacitor on the motherboard.
If any have creosote or are bulging then it is time to replace the motherboard.
Thanks,
Kelly W.
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dbruntonCommented:
Also check that your ON button is working correctly.  

You should be able to find where it connects on the motherboard.  Just short - touch briefly - the pins there and see if that starts it.
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1jawsAuthor Commented:
Checked the ON button connection and was fine.

I had just unplugged the power supply to check the capacitors and all looked fine, but when I connected the power supply back up and hit the start button i seen the fan on the mother board and the extra fan connected to it move just slightly but nothing else happened.

BTW thanks for all the suggestions.
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K_WilkeCommented:
If you haven't done it, replace the power supply.  
The power supply is giving enough electricity to make the motherboard lights come on but that is proabably it.
Thanks,
Kelly W.
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1jawsAuthor Commented:
Changing out the power supply was the first thing i tried and still nothing happened.
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dbruntonCommented:
>>  i seen the fan on the mother board and the extra fan connected to it move just slightly


Which unfortunately means nothing.  All it is indicating is that power is there on the board.

The problem is coming down to the board.  If you've removed devices and connections as suggested and swapped memory as suggested and reset the CMOS then you need to look at CPU and heatsink.  No joy there then it is either motherboard or CPU failure.  Most likely motherboard.
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srjacobCommented:
I think your motherboard is bad.  The power switch electronically shorts two pins on the power supply to turn it on.  It sounds like the electronics  to turn on the power supply is bad and preventing the power supply from coming on.  Here is something you can try to test this:

Put the video card back in the machine so you can see the POST display.  You can put all the peripherals back in the machine.  This will test the power supply and motherboard.

Look for a Green wire and a Black wire  on the motherboard power supply connector.  The green wire is the POWER-ON, and a black wire (and there are lots of them) is ground.  All black wires are tied together.  Scrape away a little bit of insulation off the green wire and a black wire, and short them together.  The power supply should come on manually.  Keep the AC power off when you scrape the insulation and short the wires together.  Then turn on the AC.  If the motherboard comes up, the power switch circuitry is bad.  If it doesn't, it probably is still the motherboard.  If the power supply doesn't come up, the power supply is dead.  And yes, I have had two dead power supplies before.

When you do this, if the power supply is overloaded, it will shut down manually.  The solution is then to get a higher wattage power supply.

If everything works fine, you can make a decision whether you want to replace the motherboard.  If you don't, remember, after you shut the machine down, you will have to manually power it off.

Also, don't forget to put some electrical tape over the scraped-off insulation.  Otherwise you could get a short someday.
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nobusCommented:
you can use my troubleshooting guide it will point you quickly to the failing parts (most was suggested though)
http://www.experts-exchange.com/Hardware/Components/Motherboards/A_1945       (Short-overview-of-how-to-troubleshoot-bad-hardware-when-a-pc-does-not-post)
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mastooCommented:
Make sure there's a speaker on the motherboard connection, in case it is trying to beep at you to indicate the problem.
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1jawsAuthor Commented:
Thanks for all your suggestions. I have decided to buy a new motherboard but now I have a new problem. I have the ASUS P5KC Combo memory with native DDR3 support (I bought 2 2gb DDR2 memory sticks)

I am having a problem finding a new motherboard that is close to this model with the DDR2

Any suggestions would be appreciated
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dbruntonCommented:
Have a look at this one http://www.newegg.com/Product/Product.aspx?Item=N82E16813130234

Don't know if is processor compatible with your present CPU though or has all of the other features that might be on the Asus board.
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1jawsAuthor Commented:
changed the motherboard with new one and still no luck!! So, last thing is CPU than?? I have a another pc at home I can take out and put the cpu to this one to see if it will work or not.. would it cause any damage to cpu? taking out from my pc to put on another one??
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asiduCommented:
Could it be that the new motherboard also has an issue?

If you have the same type of CPU you could change and test.
You could also test your faulty CPU on the working machine.
You will need make sure that you put back the thermal paste on the cpu before mounting
it back.
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1jawsAuthor Commented:
it shouldnt have any problem because it is brand new motherboard what dbruton suggested I bought that from new egg.

what do you mean about thermal paste? I dont know what is that?
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asiduCommented:
Thermal paste need to applied on the CPU, it gives a good contact between the heat sink
and CPU. If the thermal paste hardens up the transfer of heat gets bad.
It could lead to the CPU overheating and cut-off automatically. Worst scenario poor
heat dissipation could CPU failure.
Have a look at the link how to replace the CPU... http://www.fonerbooks.com/r_cpu.htm
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1jawsAuthor Commented:
I have  a ASUS P5KC motherboard and had a INTEL core 2 Quad cpu but now it seems I need a new cpu can anyone suggest a new cpu that is compatible with my motherboard. The new cpu types are a bit confusing to me.
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nobusCommented:
here the supported cpu list for your board - you can pick one as you like :
http://support.asus.com/cpusupport/list.aspx?SLanguage=en&p=1&s=22&m=P5KC&os=&hashedid=fFZ8oUIGmLpwNMjj
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nobusCommented:
and when applying thermal paste - use only a small drop; it is supposed for filling the small air pits only
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srjacobCommented:
Is it the same problem with the new motherboard as with the old motherboard?  Did you try my power supply trick of keeping the power supply permanently on?

You could have a bad power supply.
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1jawsAuthor Commented:
You could have a bad power supply.

as stated in an earlier post changing out the power supply was the first thing i tried with no success
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1jawsAuthor Commented:
I got a new CPU and NOPE still no luck and I am taking that to expert to fix it.. Thank you for all you guys help.. I am keeping this post up and let you guys know what was the problem. Then will close it. It will take 3-5 business days to figure it out what is wrong with it...
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nobusCommented:
looks like a bad mobo to me..
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1jawsAuthor Commented:
so far I had changed power supplies, motherboard and the cpu and still no luck... thats why it is time for expert to look at it..  let you guys know what was the problem 3-5 business days..
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phalanger007Commented:
a bet on memory :)
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nobusCommented:
you may have one of the rare cases where 2 devices go bad - eg cpu and mobo, or mobo and disk
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1jawsAuthor Commented:
Thank you so much all!! After all, it was power suppliy and the battery on motherboard was bad, that was the problem expert found and now all fine...
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nobusCommented:
tx for feedback
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