Motherboard issue? Not sure... Help!!

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Botey

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When my computer wasn't sending out signal to my monitor I thought it was the graphics card fault as it wasn't working. Then I replaced another graphics card but still I couldn't find any solution.
My PSU makes this weird noise like zzzzz when it is working with the motherboard. When it is working alone it sounds good and gives all the expected voltages because I measured all the cables using a multimeter.
So, I'm thinking that my motherboard could be faulty or the CPU. I'm really confused :??:. Please help!
 
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Yeah, it's sounding a lot like the motherboard is dead. I'd try getting a new, high-quality PSU first and give that a try with it as you'll want a better PSU anyway. Assuming that doesn't help, I'd go for a new motherboard next. Ouch.
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Botey

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GPU: Gigabyte Nividia GT 430 Series 1GB
CPU: Intel Core i7 3820 3.6GHz Socket 2011 10MB
PSU: 700W
Motherboard: Gigabyte GA-X79-UD3
RAM: 8GB
HDD: 1TB
Blue-Ray optical drive
Windows 7 pro

I have been using this computer for almost 3 years, I guess, and last week it suddenly started showing this problem. By the way, the CPU's and the case fans work well. .

 
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Botey

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I don't remember the model and the PC is not with me right now. I have tested the PSU and it gave me the expected results except when working with the motherboard and I don't want to buy and replace different PSU when I'm not sure if the PSU is the problem.
I have been suggested testing the motherboard by using beep making speaker and will see if the motherboard is faulty.
 
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Botey

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ok...I bought a motherboard speaker but the speaker was faulty (shorted) so, I disconnected it from its 4 pin connector and I connected the 4 pin connector to another speaker. Then, I connected the speaker to the motherboard and powered up the system. All I could hear from the speaker was a continuous noise like a ground noise.

I also connected an external speaker to the motherboard's 3.5 mm audio output. when I power the system it gives boom sound then nothing after that. There is no windows start-up sound.

TP-Link wireless internet card PCIEX1 is also connected but not working because the card has a green LED which indicates the status of the card and that LED it is not showing its light so, I'm guessing it could be a motherboard or PSU issue? Which one do you think is more likely to be the problem here?
 
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norsestar

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I'd hope for PSU as it's easier to replace, but it could be either. It's encouraging that the PSU produces the proper voltages without a load, but that doesn't prove it's not the problem. Can you check the voltages in-system by probing down the backs of the 24-pin and 8-pin connectors? Could you borrow a friend's PSU to try?

Do you get beeps if you strip it down to just the Motherboard/CPU/PSU and speaker on the 4-pin?

After that, I'd start with a visual inspection of the motherboard, looking for bulging/leaking/burst capacitors and discolored/burned spots on both sides.
 
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Botey

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Ok...I checked the voltages in-system by probing down the backs of the 24-pin and 8-pin connectors and the expected voltages were spot on. So... I think this could mean that the PSU is less likely to be the problem. I wish I could borrow friend's PSU but I cant.

As you suggested I connected only the MOBO, CPU and PSU and speaker on the 4-pin but the result was the same. I got that continuous sound, no beep.

I did visual inspection on both sides of the MOBO and it seems to be looking good. I cant see any visible damages :(

By the way the PSU is CIT Black Edition 700W it's cheap and I heard it has killed motherboards. May be it killed my BOMO to0 :(
 
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norsestar

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Yeah, it's sounding a lot like the motherboard is dead. I'd try getting a new, high-quality PSU first and give that a try with it as you'll want a better PSU anyway. Assuming that doesn't help, I'd go for a new motherboard next. Ouch.
 
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Botey

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Yup. Sadly that is what I should do but a faulty motherboard will not cause any problem on a PSU right?
By the way this is the PSU I am thinking to buy. EVGA Supernova 750G2 750W Fully Modular 80+ Gold Power Supply
 
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norsestar

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A high-quality PSU like the EVGA you're considering should be able to protect itself against overcurrent and under/overvoltage faults that a damaged motherboard might cause. You said your existing PSU was supplying good voltages when you backprobed it so the new PSU should be safe from those sorts of problems.
 
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Botey

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Thank you norsestar :)
 
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Botey

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Problem solved! It was the PSU. and that "zzz" sound was actually telling that. Cheap component will never do for long time and that is what I have learned. I'm glad I didn't spend money on another MOBO. Thanks again for you help!
 
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