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Failure to boot

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November 27, 2010 4:29:28 PM

All right, I’m having problems with my PC (surprise surprise)
I bought a new case (NZXT Phantom) and motherboard (Gigabyte GA-890FXA-UD5) for my PC, and now it won’t boot. I press power, fans light up and whirr for about 1 second, then everything powers down. I then have to turn my PSU off fully and wait about 30 secs before I can actually try and turn it on again. The PSU is fine, the old paperclip trick works fine, its just when plugging things in it doesn’t work. I’ve tried reseating everything from cards to drives and cables, also tried starting without anything plugged in, trying to find the root by seeing which doesn’t boot, but that didn’t work as it didn’t even boot to begin. Occasionally, it will boot for more than a second, but it will not post and the GPU fan will spin at max speed for about 10secs, then the PC will power off again.
The power supply is a Be Quiet! DarkPower Pro 1000w, so its not exactly underpowered, and the motherboard is brand new, so that shouldn’t be the problem. I’ve had enough issues with Asus motherboards and thought that Gigabyte would be more stable, and I hope I’m not proved wrong.

I’ve also been through all the troubleshooting tips I can find across the web, so this is my last ditch attempt for finding out whats wrong, if you can offer any assistance it would be greatly appreciated.

More about : failure boot

November 27, 2010 5:07:57 PM

2dme said:
All right, I’m having problems with my PC (surprise surprise)
I bought a new case (NZXT Phantom) and motherboard (Gigabyte GA-890FXA-UD5) for my PC, and now it won’t boot. I press power, fans light up and whirr for about 1 second, then everything powers down. I then have to turn my PSU off fully and wait about 30 secs before I can actually try and turn it on again. The PSU is fine, the old paperclip trick works fine, its just when plugging things in it doesn’t work. I’ve tried reseating everything from cards to drives and cables, also tried starting without anything plugged in, trying to find the root by seeing which doesn’t boot, but that didn’t work as it didn’t even boot to begin. Occasionally, it will boot for more than a second, but it will not post and the GPU fan will spin at max speed for about 10secs, then the PC will power off again.
The power supply is a Be Quiet! DarkPower Pro 1000w, so its not exactly underpowered, and the motherboard is brand new, so that shouldn’t be the problem. I’ve had enough issues with Asus motherboards and thought that Gigabyte would be more stable, and I hope I’m not proved wrong.

I’ve also been through all the troubleshooting tips I can find across the web, so this is my last ditch attempt for finding out whats wrong, if you can offer any assistance it would be greatly appreciated.



From what I see from reading your post it looks like you have a problem with your Motherboard. I have ordered new boards that were bad and they did what yours is doing.
Start buy checking your ram one stick at a time and see if anything changes as it boots up. That way you can rule out a bad stick of ram. If you have a spare CPU setting around try that CPU and see if that works. If you have a way to check your parts in another Computer that is what I would do.
the more parts you can rule out then you will find the problem.

Hope this helps.
Chris..
November 27, 2010 5:08:48 PM

Indeed, if you try to boot it up without ram does the mobo beep at you?
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November 27, 2010 5:17:18 PM

It does, it does short, continuous beeps then switches off again.

My Ram is 2*2GB OCZ Platinum, GPU is a powercolor 4890 PCS+, CPU is AMD Phenom II 955 BE
a c 122 B Homebuilt system
a c 156 V Motherboard
November 27, 2010 11:01:47 PM

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 beeps 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. 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.

Motherboard LED's mean very little. When on, all they are telling you is that the computer os plugged into a live power socket and the PSU is switched.

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

If no beeps:
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.
a b B Homebuilt system
a b V Motherboard
November 27, 2010 11:22:51 PM

If the power supply has to be turned off at the mains to enable you to switch it on again this means that either the power supply is faulty or it has shut down due to a short circuit. Try either a new power supply or take the motherboard out of the case and try it on the bench.
November 28, 2010 10:28:26 AM

All right.
Jsc, I've tried much of what you've suggested already, and i can't find the cause because it turns off before i get beeps usually, although, yes i do have a motherboard speaker. I've had it boot without RAM and its given me continuous short beeps, which is a power error according to my Gigabyte users manual. I've shorted the power supply like you suggested and it turns on fine and whirs away no problem. Unfortunately i'm at uni at the moment so all my spare stuff is at home, and i won't be able to go back for another few weeks. I've just breadboarded and thats yielded the same results. I'm currently trying with my old mobo (Asus M4A79t Deluxe) which i replaced thanks to the downclocking error it produced with my 955BE.
November 28, 2010 10:39:16 AM

Okay, it does the same thing even with my other motherboard, do you think it is the power supply?
!