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Need some input on no boot issue.

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October 3, 2010 9:05:30 PM

CPU: pentium 4 HT (478) 2.8ghz
MB: Gigabyte GA-8IPE1000 Pro2
Ram: 2GB DDR1 266MHz Supertalent
PSU: new Corsair TX750w, (old AGI 400w)
GPU: EVGA geforce 6200
Ethernet card
Creative Sound "LIVE!" card

Age of most of the components: 5 years


My issue started yesterday with the old AGI 400w psu, that lasted for 5 years, had killed over.

Well, replaced it with the TX750w psu hoping that the old psu didn't take anything else with it. well, seams that it did take another component out when it died as all fans and HDD's power up but there is no post and beep code.


Well, My dad and I have followed the guide on here about no post issues with no success.

Taken out practically everything.. Nothing. We've even taken out the cpu. We guess that would do nothing but we were just checking to see if there was something different.

So where stumped. We're either guessing a few things.

A chip on the motherboard, Maybe the south bridge or something like it has fried.

Cpu fried



Although I want to take on your guys options of what maybe wrong or what My dad and I've overlooked. I dont have high hopes.

Thank you for taking your time looking into this.

More about : input boot issue

October 3, 2010 9:46:09 PM

When you took the components out, did you get any beeps when you booted the PC, or still no beeps?
Did you take the components out all at once or one at a time, maybe try a combonation of this.
I'm guessing if you don't get any beeps at all then something on the motherboard is gone.
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October 3, 2010 10:01:21 PM

brettms71 said:
When you took the components out, did you get any beeps when you booted the PC, or still no beeps?
Did you take the components out all at once or one at a time, maybe try a combonation of this.
I'm guessing if you don't get any beeps at all then something on the motherboard is gone.


No beeps what so ever.

We've took them out 1 by one till we were just left with the MB, CPU, and PSU. Then just the MB and PSU.

im guessing it's the MB at well.
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October 3, 2010 10:22:24 PM

Check the tops of all your diods to see if any are domed or popped up. if you find one then thats your answer.
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Best solution

a c 122 B Homebuilt system
October 4, 2010 3:34:29 AM

carden49 said:
Check the tops of all your diods capacitors to see if any are domed or popped up. if you find one then thats your answer.

Failure mode of a diode is usually a not visible internal short.

Work through our standard checklist and troubleshooting thread:
http://www.tomshardware.com/forum/261145-31-read-postin...
I mean work through, not just read over it. We spent a lot of time on this. It should find most of the problems.

If not, continue.

I have tested the following beep patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different.

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

Breadboard with just motherboard, CPU & HSF, case speaker, and PSU.

Make sure you plug the CPU power cable in. The system will not boot without it.
You also need the CPU. :) 

I always breadboard a new build. It takes only a few minutes, and you know you are putting good parts in the case.

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. Remember, at this time, you do not have a graphics card installed so the load on your PSU will be reduced.

If no beeps:
Running fans and drives and motherboard LED's do not necessarily indicate a good PSU. In the absence of a single short beep, they also do not indicate that the system is booting.

At this point, you can sort of check the PSU. Try to borrow a known good PSU of around 550 - 600 watts. That will power just about any system with a single GPU. If you cannot do that, use 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.

If the system beeps:
If it looks like the PSU is good, 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. It's possible that you can pass the POST with a defective video card. The POST routines can only check the video interface. It cannot check the internal parts of the video card.

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October 4, 2010 9:33:52 PM

jsc said:
Failure mode of a diode is usually a not visible internal short.

Work through our standard checklist and troubleshooting thread:
http://www.tomshardware.com/forum/261145-31-read-postin...
I mean work through, not just read over it. We spent a lot of time on this. It should find most of the problems.

If not, continue.

I have tested the following beep patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different.

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

Breadboard with just motherboard, CPU & HSF, case speaker, and PSU.

Make sure you plug the CPU power cable in. The system will not boot without it.
You also need the CPU. :) 

I always breadboard a new build. It takes only a few minutes, and you know you are putting good parts in the case.

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. Remember, at this time, you do not have a graphics card installed so the load on your PSU will be reduced.

If no beeps:
Running fans and drives and motherboard LED's do not necessarily indicate a good PSU. In the absence of a single short beep, they also do not indicate that the system is booting.

At this point, you can sort of check the PSU. Try to borrow a known good PSU of around 550 - 600 watts. That will power just about any system with a single GPU. If you cannot do that, use 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.

If the system beeps:
If it looks like the PSU is good, 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. It's possible that you can pass the POST with a defective video card. The POST routines can only check the video interface. It cannot check the internal parts of the video card.


Well, thanks for the list/help. Although to bad none of it helped. Im just going to have to say that the MB and/or cpu did get taken out when the old PSU failed. My dad has also ask an old freind that works as an IT sever guy at a city my dad used to work at. He came to the same conclusions as My dad and I have.

We could try to buy another P4 cpu to see if that the issue. Although, we really dont like the thought of used hardware.

Oh well, better off build new. :D 

As said, thank you all for you're help.


As for Carden, It's a capacitor that can Buldge or pop. Not a diods ;) 

If any were doing that, about 3 of them were bulging but they been like it for over a year scene I've notice it.
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October 4, 2010 9:34:52 PM

Best answer selected by warmon6.
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