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Please help quick as possible everyone, real problem. Thank you so much

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July 5, 2010 8:13:08 AM

Hello,
I turned on my computer this morning and It just would'nt. When I pressed the power button nothing happens. My motherboard does not have a light on I think or at least I could not see one, but the light for the psu on the of the computer is on. The computer is a prebuilt core 2 duo Hp computer and I really need to use it today? are there any suggestions? I don't have a spare power suply to test it with.
Thank you so much for your help I'm really stuck =(

More about : quick real problem

July 5, 2010 9:08:13 AM

adam_x_brookes said:
Hello,
I turned on my computer this morning and It just would'nt. When I pressed the power button nothing happens. My motherboard does not have a light on I think or at least I could not see one, but the light for the psu on the of the computer is on. The computer is a prebuilt core 2 duo Hp computer and I really need to use it today? are there any suggestions? I don't have a spare power suply to test it with.
Thank you so much for your help I'm really stuck =(

Hi
Have you checked if the power cable connected to the psu is connected tightly?
July 5, 2010 9:11:59 AM

lordszone said:
Hi
Have you checked if the power cable connected to the psu is connected tightly?


Yes, I've also tried using a different power cable as well.
Related resources
July 5, 2010 9:16:16 AM

adam_x_brookes said:
Yes, I've also tried using a different power cable as well.

hi
y dont u do like this that take out the 24 pin connecter and short the green wire and any black wire with some metal, should have the psu connected to power and switched on. if the psu starts that means the psu might be fine. try it and let me know
July 5, 2010 9:22:44 AM

lordszone said:
hi
y dont u do like this that take out the 24 pin connecter and short the green wire and any black wire with some metal, should have the psu connected to power and switched on. if the psu starts that means the psu might be fine. try it and let me know


Thank you for the help mate, could you explain in a bit more detail please?
July 5, 2010 9:40:56 AM

adam_x_brookes said:
Thank you for the help mate, could you explain in a bit more detail please?

Hi
The method i am telling u will tell you if your psu is fine or not. open the computer casing.
take out the 24 pin connector of psu which is connected onto the motherboard.
and look at that connector
u will see that there is one green colour thin cable and more than 1 black cables
take a tweezer or a staple pin and put on end of the metal in the black wire and the other on the green wire. then the psu will run automatically, this is normal. if it did not run then either u arent doing it correctly or the psu is faulty.
a c 144 ) Power supply
July 5, 2010 10:03:48 AM

Actually, if if the PSU fan runs, it may still be bad. The "short the green to black wire" check does not test the main part of the PSU under load.

You have worked through our standard checklist and troubleshooting thread:
http://www.tomshardware.com/forum/261145-31-read-postin...
yes? I mean work through, not just read over it.

Breadboard - that will isolate any kind of case problem.
http://www.tomshardware.com/forum/262730-31-breadboardi...

The breadboarding thread has a paragraph about how to build and test a PC in stages. Breadboard with just motherboard, CPU & HSF, case speaker, and PSU.
You do have a case speaker installed, right? If not, you really, really need one. If
your case or motherboard didn't come with a system speaker, you can buy one here:
http://www.cwc-group.com/casp.html

You can turn on the PC by momentarily shorting the two pins that the case power switch goes to.

You should hear a series of long, single beeps indicating memory problems.
Silence indicates a problem with (in most likely order) the PSU, motherboard, or CPU.

If you get silence, you can sort of check the PSU. The best way is to borrow a known good PSU. If you cannot do that, borrow a DMM to measure the voltages. Measure between the colored wires and either chassis ground or the black wires. Yellow wires should be 12 volts. Red wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.

The gray wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.

You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.
http://www.youtube.com/watch?v=5FWXgQSokF4&feature=yout...

This checks the PSU under no load conditions, so it is not completely reliable. But if
it can not pass this, it is dead. Then repeat the checks with the PSU plugged into the computer to put a load on the PSU.

Install a memory stick. Boot. Beep pattern should change to one long and several short beeps indicating a missing graphics card. Silence or long single beeps indicate a problem with the memory.

Insert the video card and connect any necessary PCIe power connectors. Boot. At this point, the system should POST successfully (a single short beep). Notice that you do not need keyboard, mouse, monitor, or drives to successfully POST.

Now start connecting the rest of the devices starting with the monitor, then keyboard and mouse, then the rest of the devices, testing after each step.
July 5, 2010 10:17:59 AM

lordszone said:
Hi
The method i am telling u will tell you if your psu is fine or not. open the computer casing.
take out the 24 pin connector of psu which is connected onto the motherboard.
and look at that connector
u will see that there is one green colour thin cable and more than 1 black cables
take a tweezer or a staple pin and put on end of the metal in the black wire and the other on the green wire. then the psu will run automatically, this is normal. if it did not run then either u arent doing it correctly or the psu is faulty.


Hello, I'm about to try it now, but I just wanted to check something. Before when I plugged in the power chord the psu light stayed on in a constistant fasion, now that I have the 24pin connector unplugged it's most flashing? Is this normal and should I still go ahead? and also, are you sure this won't electricute me haha. Thank you agian for your help dude.
July 5, 2010 10:31:07 AM

OK I tried it and good news I think. When I put a paperclip between those to wires, the psu worked and powerd up my disk and hard drive, so does this mean its either my motherboard, or perhaps a problem with my power button, is there a way to jump start your power on button? Thanks for you help again
July 5, 2010 10:54:57 AM

jsc said:
Actually, if if the PSU fan runs, it may still be bad. The "short the green to black wire" check does not test the main part of the PSU under load.

You have worked through our standard checklist and troubleshooting thread:
http://www.tomshardware.com/forum/261145-31-read-postin...
yes? I mean work through, not just read over it.

Breadboard - that will isolate any kind of case problem.
http://www.tomshardware.com/forum/262730-31-breadboardi...

The breadboarding thread has a paragraph about how to build and test a PC in stages. Breadboard with just motherboard, CPU & HSF, case speaker, and PSU.
You do have a case speaker installed, right? If not, you really, really need one. If
your case or motherboard didn't come with a system speaker, you can buy one here:
http://www.cwc-group.com/casp.html

You can turn on the PC by momentarily shorting the two pins that the case power switch goes to.

You should hear a series of long, single beeps indicating memory problems.
Silence indicates a problem with (in most likely order) the PSU, motherboard, or CPU.

If you get silence, you can sort of check the PSU. The best way is to borrow a known good PSU. If you cannot do that, borrow a DMM to measure the voltages. Measure between the colored wires and either chassis ground or the black wires. Yellow wires should be 12 volts. Red wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.

The gray wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.

You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.
http://www.youtube.com/watch?v=5FWXgQSokF4&feature=yout...

This checks the PSU under no load conditions, so it is not completely reliable. But if
it can not pass this, it is dead. Then repeat the checks with the PSU plugged into the computer to put a load on the PSU.

Install a memory stick. Boot. Beep pattern should change to one long and several short beeps indicating a missing graphics card. Silence or long single beeps indicate a problem with the memory.

Insert the video card and connect any necessary PCIe power connectors. Boot. At this point, the system should POST successfully (a single short beep). Notice that you do not need keyboard, mouse, monitor, or drives to successfully POST.

Now start connecting the rest of the devices starting with the monitor, then keyboard and mouse, then the rest of the devices, testing after each step.


I havent got a system fan =( and I really need to use my computer today =/
I meant system speaker
July 5, 2010 2:48:30 PM

A similar thing happened to me and it turned out that the motherboard was fried. The rest of the parts were AOK though, GPU, RAM, PSU, CPU, etc...

The one way to find out what is causing trouble is by swapping parts to see which one is at fault.
July 5, 2010 6:02:57 PM

adam_x_brookes said:
Any one please help me?

Hi
i c that your psu seems to be ok
if you want to test the power button thenu would have to look at the motherboard's manual. this is because there are pins that you short and your system will power on but those pins are different in each motherboards and especially in the branded systems. in nearly all the latest boards, it is written near the pins that specific two pins are for power switch and etc. you would have to find then on your motherboard if you dont have the manual for it.
!