cpu fan throttling and black screen

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Wazawaza

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Jul 13, 2014
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Greetings,

I have a problem and I would like to have your opinions on how to proceed please.
My pc is on and everything looks to be working smoothly at idle, when suddenly the cpu fan starts throttling without any apparent reason (56ºC) and my screen goes black. It used to work again after a reset, but today the screen stays black, even though the mobo makes the beep after I turned it on. All fans work as they should, except for the cpu fan that seems to be at maximum rotations.

These components are 6 years old and I have had some similar issues before but nothing like this. I had them installed in an old pc case with very little ventilation, which worried me, so I replaced the case 2 weeks ago for a bigger case with 3 fans controlled by a rheobus.

I read some responses to problems similar to mine here and most say it is a psu problem, but could a faulty psu make the cpu fan throttle to max speed? It also doesn't have the smell of ozone.

The psu is not the best and the cables were kind of short so everything is tight inside the case. I also noticed that it might have slightly bent the gpu (but I think it's the weight that makes it do that).

I don't really know where to start looking, there are so many possible suspects (hdd is one of them, but I don't see a connection with the cpu fan), any help is welcome.

Thank you for reading,
Cheers

My configuration is:
mobo: G41M-GS3
CPU: core2 quad Q9550 2.8 ghz
CPU cooling: Master cooler tx3
Ram: Kingston DDR3 2x4 gb 1600 CL9 (max. bandwith: 667 Mhz)
Graphics: Sapphyre AMD Radeon HD 6950 1 gb
PSU: Eurosys 500W
 
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dark_lord69

dark_lord69

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Agreed , that's the first thing that came to mind... NOT your power supply.
It's actually sounds like your CPU might be toast at this point.

Typically when fans kick into high speed it's because the system is detecting a nearly overheating part.

"even though the mobo makes the beep after I turned it on."
How many beeps? You may be hearing a beep code that's trying to tell you what the issue is. Check your manual to find out what those beeps mean.

Also, it's more likely to be a bad heat sensor than a power supply making a fan go nuts. A bad heat sensor would cause the same issue.
 
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Wazawaza

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Thank you Yamitime for your swift reply.

I think I will replace the tx3, who actually seemed a little bit wobbly and didn't make the click sound when I installed it, for the old stock cooler.
I hope I have an image, if so I will post a temps read by hwmonitor, if not I will replace the current gpu for my older nvidia 9800gt 1gb.

I really had no idea where to start.
 
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Wazawaza

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Thank you dark_lord,

I read some posts before posting myself (there could have been already an answer) and I also didn't find logic in the psu solution.
About the beep, it only beeped once, like it always does.

I will test this and keep you posted.
 
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Yamitime

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Good plan .

 
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Wazawaza

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Sorry for taking so long.

I replaced the cpu stock cooler and it turned on (asked me if I wanted to restore my pc to a previous moment, I selected "yes").

I will leave it like this for a day or two, to see if something else happens.
I have two pictures from hwmonitor, but I don't know how to attach images on my post :S

 
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Yamitime

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Good job Wazawaza ,come back and tell if its sorted.

 
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Wazawaza

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Thank you :D
The temps seem a little bit high (60ºC at idle, 66ºC when playing a light flash game), but it's an old stock cooler. This pc is not for heavy duty, more to go surf the web and a little bit of photoshop from time to time.

I will wait a few days and if nothing else happens, I will pick your first answer as the solution.

Thanks again,
Cheers
 
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Yamitime

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Those temps are a little high but it is a stock cooler . You may be able to source a better cooler and some good paste and take care when fitting. This will definitely lower temps more than stock cooler.
 
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Wazawaza

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I think I can still use my tx3, I simply need to replace the push pins, all I have to do is find some new. With this cooler they really clicked soundwise, whereas on the tx3 they made no noise and seemed wobbly
 
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Wazawaza

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Update:
Well, it lost image and didn't react again (no mouse and the monitor didn't turn on from sleep mode). It worked fine after a restart, but I just shut it off for now :S
Even if I think the cpu might be the faulty piece, I am curious, could a faulty hdd have the same symptoms? Because this hdd has not been treated with "extreme" care along the years.
 
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Yamitime

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You can check the disk for errors right clicking on drive /tools error check ,or you can check your system files using scanow.
You can google is you get stuck with either.

 
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Wazawaza

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Thanks for the tip, I used hdtune a few days ago and it said that no sectors were damaged. I will check scannow (forgot to do that).
Yesterday, I removed the gpu and used only the onboard; ran a cpu stress test with OCCT for 40 minutes, with temps not exceeding 67ºC at 100% charge.
I also did a clear cmos.
I reinstalled the gpu with no crashes during the 4 hours it was turned on.
I will do the scannow to see if there is any hidden problem.
 
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Yamitime

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Well we are making progress :)
 
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Wazawaza

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Step by step ^^
I should have done the clear cmos right at the beginning, I already had a problem some years ago and that was the solution, but I made a bad diagnosis and bought new parts, when they were not necessary XD
I am looking more and more at the gpu, I believe it's own weight is causing it to bend (the gpu and mobo are a 6 years old couple, tensions are unavoidable hehe)
 
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Wazawaza

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Well, I have a new piece of information, more precisely a detail.
I just ran an Unigine test to the gpu and after a few minutes it started making a buzzing sound (a faint buzzing, I had to put my ear close), which stopped each time the image was black or froze for a few frames.
Maybe it's normal and I just noticed now, or something is under a lot of stress :S
The test was using high settings and got from 9 to 177 fps, avg fps 80 and a score of 2200.
 
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Karadjgne

Karadjgne

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Pull the gpu out and run the video directly from the mobo. Blackscreens are historically gpu related, but in this case it could also be psu related, more so than cpu (usually bluescreens). You've got a substandard 500w psu, and a HD 6950, recommended wattage being 500w. It's entirely possible the psu has eventually worn down the gpu internals after many years of bad current/voltage output. Almost all of those substandard psus are not worth counting on more than about half what the manufacturers claim, and thats under 20-30°C working limits. Honestly looks like either the gpu or psu is at end of life age now.
 
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Yamitime

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Thats just coil whine ,Some cards get it more than others . Usually when its under load.
Nothing to worry about.
 
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Wazawaza

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Thank you for your input Karadjgne.
I must admit that after the tests and configuration changes I made, the gpu and the psu look like the most probable suspects.
Unfortunatly, I wasn't the one that chose this psu, I would have chosen one more reliable and powerful. I also needed some molex adaptors to be able to turn the pc on. It's possible the pc is consuming too much power.
It's been on for 6 hours now and no crashes. I will keep an eye on it for a few days.
 
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Wazawaza

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Well then, after 3 days with no crashes, I believe I know what the problem was (and still is).
After the exchange we had on this topic, I began thinking that I wasn't testing as I should have had. I only tested the pc without any external devices connected to it, but in normal conditions, some devices would have been connected to the pc.
My theory is that those devices divert too much power from the psu, which makes the pc to be unstable, causing it to crash.
These last 3 days, I set it back to it's regular place and working as it does normally, without any external devices connected. I will connect them tomorrow and see if it crashes again, therefore confirming my current theory.
I am almost certain that this is the issue, and I wouldn't have gotten here without all your precious advice, so thank you Yamitime, Karadjgne and dark_lord69.
I had no idea where to start and you guys kind of guided me through the troubleshooting :)
 
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