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Computer wont post


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#1
Ramaddil

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So I have a Home Built Computer with the following specs

Amd Phenom II x4 955BE
on a GIGABYTE GA-MA790GPT-UD3H AM3 Mobo
With 8GB of DDR3 1600

Running Windows 7

Now here is my issue. I put my computer in sleep mode to save power and to use a Wake on Lan feature to only power it up when I needed to when I was away from home. I came to my computer this afternoon after it had been in sleep mode for 12-15 hours and pressed a button to wake it up, and it powered up but I had a blank screen and nothing was happening. So I tried to restart my computer and my restart switch would not reset the computer, nor would the power switch. So I turned the power supply off to get the computer to turn off. When I tried to power it back up the computer would turn on but would not post.

I have tried reseting the CMOS battery by jumper and by removing and replacing the battery back in. Note this computer had been running fine for over 1 year with no issues so this is not a new computer. When I turn the computer on by switch all the fans come on inside the computer including the CPU fan. Nothing happens at this point the screen stays black and the computer will not do anything. On a side note it makes my Raedon 5850 fan spin up and be very loud. I have since unplugged it and ran on the motherboards on board graphics to trouble shoot. At this point also my power switch and reset switch will not turn off nor restart the computer.

I do not have a spare CPU to test to see if it is the motherboard or the CPU that might be dead or malfunctioning. Does anyone have any ideas of what the issue could be or if it may be a dead mobo or CPU?

Any help would be greatly appreciated.
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#2
iammykyl

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Hi Ramaddil.

Do you have a system speaker or on-board motherboard diagnostic lights?

Before the problem, did you get a single beep or an OK light on boot up?

Do you get any signals now?

After clearing the CMOS were you able to enter BIOS, reset time and date, load optimised defaults, save and exit?

What is the make and model of the PSU?
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#3
Ramaddil

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My psu is a corsair 850 watt. But it's not the power supply I tested the power going into the mobo with a volt meter and it was at 12.05 vdc. I have a blank screen after reseting the bios. My case a thermaltake armor vh6000 does not have a internal speaker or none that I saw. It has 2 ports for a headphone and microphone that can go into the motherboard on the f audio panel. I hooked it up and listened with a head phone when I started it up but no sound. I don't believe I had any lights or sounds only that when the computer booted up my CPU fan would start and then once it posted it would increase speed and you could hear a noticeable difference

Edited by Ramaddil, 07 February 2011 - 07:51 AM.

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#4
iammykyl

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But it's not the power supply I tested the power going into the mobo with a volt meter and it was at 12.05 vdc.

This result does not mean the PSU is good. There could be a problem on any rail, incorrect amps or unstable power. The only way to be sure is to test it on a specialist rig. Enquire at you local PC outlet to see if they can test the PSU incase we can not find another problem.

My case a thermaltake armor vh6000 does not have a internal speaker or none that I saw. It has 2 ports for a headphone and microphone that can go into the motherboard on the f audio panel. I hooked it up and listened with a head phone when I started it up but no sound. I don't believe I had any lights or sounds

A system speaker is separate from the sound system and can only be heard when connected to 2 pins usually found on the system panel header, (next to the power on or reset pins.)

If you can get hold of one from a PC outlet, new or second hand, the beep codes, (a list in the motherboard manual) can indicate what problems your system has.

On a side note it makes my Raedon 5850 fan spin up and be very loud. I have since unplugged it and ran on the motherboards on board graphics to trouble shoot.

The fan would run at full speed until the OS completes loading.

Did you remove the video card from the slot? or did you just disconnect the power cable?

I don't believe I had any lights or sounds only that when the computer booted up my CPU fan would start and then once it posted it would increase speed and you could hear a noticeable difference

Is this still exactly the same?
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#5
Log2

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Also what you'll want to try is removing any unnecessary components, that is to say, unplug any ipods, anything else connected via USB/FireWire. You'll want to take out all your RAM and use only one stick, but take it out first and re-seat it. Also be sure to remove any extra Hard Drives, and re-seat the hard drive (Power cable and sata cable) that has Windows on it. Remove the Video card completely from the case. And remove anything else that is installed on your computer, that is to say, sound cards, PCI cards, PCI-E cards. If you have a can of compressed air, use it generously on the inside of the computer. If you have extra thermal paste, remove the CPU Fan, and re-seat the CPU.

Now do the jumpers, connected to onboard video, remove anything connected at the back including Keyboard and Mouse. Try starting the computer.

If it starts, try reseating the components one by one
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#6
Ramaddil

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would a power supply tester, be able to identify if it is bad or not?
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#7
phillpower2

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Hi Ramaddil,
If your OS is W7 64bit try running with only 4GB of Ram fitted, the MBs specs say up to 16GB of Ram but a lot of people have had issues with W7 and more than 4GB of Ram fitted, blue and black screens, onboard video going out etc.

would a power supply tester, be able to identify if it is bad or not?

No not convincingly, the test rig Techs use for testing PSUs simulates/puts the PSU under load in various usages, booting up, shutting down, gaming for example.
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#8
Ramaddil

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I have tried that already... I went down to a single stick, tried all of them individually but no joy. I have already ordered a new Mobo and Processor, because number 1 I think its one of those that is causing the problem and number 2 i really wanted to upgrade to a 6 core since I do alot of encoding etc. I guess I really don't want to go spend money on a test from a "specialist" because they are gonna charge me a arm and a leg for a test, when I could probably buy a new one for the same cost or a little more. Maybe I will look into it but I dunno I just believe that the people in the repair business over charge for tests.
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#9
phillpower2

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Ok good luck.
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#10
Ramaddil

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Thanks for the info... just frustrated with this.. I really dont know how much a repair shop would charge to check my Power Supply if I knew and it was cheap I would probably have them check it out.. But if they charge 50.00 just to tell me its not working then I have to buy a 100.00 power supply then its kinda a waste of money.. I usually have parts on hand to test things out but this is the first quad core processor i have, and the only power supply i have that is not being used is a 400watt without the 8 pin connector I need to plug into the motherboard to completely power things up.
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#11
iammykyl

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Hi.

You really need to make sure the PSU is OK. If there is a fault on it and it has damaged the Mobo or CPU and you plug it into your new hardware, You could end up frying your investment.

My local shop will test a PSU for free so ring around and find out if or what it will cost you.

We need to be a little more disciplined in the steps for trouble shooting.

Please make sure that only the following parts are properly connected.

Switch off the PSU.

Take anti static precautions.

Mobo and CPU, CPU fan.

All the ram.

Hard drive.

Monitor.

Keypad.

1. Hold in the power button for about 20 seconds,(with it still held in_ switch on the PSU) If no good.

2. Turn off the power. Remove the plugs from the power on and reset motherboard front panel header. Turn on the power. With a small bladed screwdriver short out the 2 pins for power on, if the computer starts, there is a fault on the case switch. If no good, turn off the power and reconnect the 2 plugs.


3. I know you have tried some RAM swapping but you need to try every stick in every slot until you find a stick that is bad or a slot that is bad.
When testing I number each stick with a felt tipped pen, so as not to get mixed up. Make sure to switch off for every step and to take anti static precautions. Start with one stick in the first slot, same stick in second slot and so on.

Edited by iammykyl, 07 February 2011 - 09:06 PM.

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#12
Ramaddil

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Thanks for the advice I am going to try to bring it by a shop tomorrow and see what they charge my new parts wont be in till wed or Thursday so i will see what they say... if nothing else if it is the PSU i will replace it and be able to move this parts that are in this computer to my server pc and make it a little better..

I have been building and servicing my own stuff for 10+ years and I really have a hard time asking others for help and or trusting some of the crooked shops out there.. Because I know they exist and its hard for me to trust what they say.
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#13
iammykyl

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Was your case power button OK?

I always ask when stuck, cause you can' know everything and sometimes you miss the obvious.

Please keep us posted on your progress.
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#14
Ramaddil

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Wow... here is what I did so far I followed your instructions almost.. I did not plug in all my ram yet but with what you suggested by holding the power button down i was able to actually get the computer to boot.. Albeit i had already unplugged the cpu cleaned it off and also cleaned off the cpu fan and put it all back in and i got it to boot up.. gonna continue to further test out and make sure everything works one piece at a time..
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#15
iammykyl

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I hope you applied some new TIM?
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