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Lawnmower noise - PSU?

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banned9y, 5m agoPosted 9 years, 5 months ago
When I turn me PC on after it's been off for about 30 minutes, a loud and constant fan noise is coming from my system. What's confusing me is that the noise will disappear if I turn the computer off fully (still happens if I restart) and put it back on, never happening at all again until the system has been off for awhile.

Why would the PSU/whatever be noisy only after the computer has been off for awhile?
Aion Avatar
banned9y, 5m agoPosted 9 years, 5 months ago
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#1
Perhaps your comp needs a good clean. Open it up and get rid of all the dust! Other than that....:? :thinking:
banned#2
Will be taking the side off to see exactly where the noise is coming from (pretty sure it's the PSU) tomorrow or Friday, so I'll clean it then.

The next 10/10 Dell deal can't come soon enough - 2D games, videos on video sites and images have lines flashing on the screen. Added onto this...
#3
PSU fan
CPU fan
North Bridge fan
Case fan
GFX card fan

take your pick ;-)
banned#4
Only two fans working - GPU and PSU. The mobo fan hasn't been working for awhile.

It's not really the identity of the culprit I'm looking for - I don't understand why it only happens after being off for awhile and stops if you wait for everything to turn off fully before turning it back on...
#5
Two theories.

1. bit of crud in fan, fan warms up and stops making a noise as it expands.
2. fan stops working when it gets too hot.
banned#6
How would I gain access to the PSU fan?

It's no trouble for me to turn my system straight off after turning it on, waiting a few secs for the fans to stop and turn it back on, but I doubt that's going to do my system much good.
#7
Aion
How would I gain access to the PSU fan?

It's no trouble for me to turn my system straight off after turning it on, waiting a few secs for the fans to stop and turn it back on, but I doubt that's going to do my system much good.



[COLOR="Red"]Please don't open the PSU, unless you know what your doing[/COLOR]

You can buy cans of compressed air to blow away any dust on the fan.
banned#8
stora
[COLOR="Red"]Please don't open the PSU, unless you know what your doing[/COLOR]

You can buy cans of compressed air to blow away any dust on the fan.


Wasn't planning on just opening it blindly. I was hoping there would be a noob friendly way of being able to clean the fan. :p

Can of compressed air, got it.
#9
stora
[COLOR="Red"]Please don't open the PSU, unless you know what your doing[/COLOR]

You can buy cans of compressed air to blow away any dust on the fan.


Unless you blast it from the inside out, All you're doing is blowing the dust inside the PSU.

I've opened my PSU a number of times, Its a couple of screws and the outside case pulls apart, Then I clean the inside/fan, Put it back together, place it back in the PC, Job done!

Obviously you should only clear it when you know what your doing, I followed a proper tutorial on the interweb. :)
banned#10
Iom-RF
Unless you blast it from the inside out, All you're doing is blowing the dust inside the PSU.

I've opened my PSU a number of times, Its a couple of screws and the outside case pulls apart, Then I clean the inside/fan, Put it back together, place it back in the PC, Job done!

Obviously you should only clear it when you know what your doing, I followed a proper tutorial on the interweb. :)


Tbh, I'd be way too afraid of shortening the life of my PC/PSU further by going inside to try and fix it. The best option would be to take it to a repair shop and let them see what they can do...problem is, my area doesn't exactly have an abundance of trustworthy PC repair shops.

I feel like I'm waiting for my PSU to pack in. Couldn't have come at a much worse time - After my 2x Dell E520 hell and TV dying. Going to be in a right mess if I can't access the net freely to shop for a new comp and TV...
#11
Iom-RF
Unless you blast it from the inside out, All you're doing is blowing the dust inside the PSU.

I've opened my PSU a number of times, Its a couple of screws and the outside case pulls apart, Then I clean the inside/fan, Put it back together, place it back in the PC, Job done!

Obviously you should only clear it when you know what your doing, I followed a proper tutorial on the interweb. :)



Thats true, but we only need to clean the fan. No need for a spring clean of whole PSU ;)
#12
Aion
When I turn me PC on after it's been off for about 30 minutes, a loud and constant fan noise is coming from my system. What's confusing me is that the noise will disappear if I turn the computer off fully (still happens if I restart) and put it back on, never happening at all again until the system has been off for awhile.

Why would the PSU/whatever be noisy only after the computer has been off for awhile?


What system have you got?
#13
Iom-RF
Unless you blast it from the inside out, All you're doing is blowing the dust inside the PSU.

I've opened my PSU a number of times, Its a couple of screws and the outside case pulls apart, Then I clean the inside/fan, Put it back together, place it back in the PC, Job done!

Obviously you should only clear it when you know what your doing, I followed a proper tutorial on the interweb. :)


Actually by using compressed air you can dislodge the dust which will then be moved out of the PSU by the fans - the main problem isn't so much where the dust is sitting it's more the fact that it can't be moved by the fan. Also, as long as you blow in the right directions you can normally ensure the dust comes out one of the PSU's other vents.

John
#14
stora
Thats true, but we only need to clean the fan. No need for a spring clean of whole PSU ;)


Well at the time my PSU was 4 years old so quite a bit of dust had gathered, A spring clean and it was a lot quieter.
banned#15
Where the heck would you buy a can of compressed air? No-one I've asked seems to have a clue. :p

Tried turning my hover on max and moving it around the outside of the fan vent. It removed lots of dust, but sadly didn't fix the noise.

Anyway... If the problem could be cured by removing the muck inside, surely the noise would happen 24/7, not stopping (lke it does) if I turn my computer off fully?
#16
Aion
surely the noise would happen 24/7, not stopping (lke it does) if I turn my computer off fully?


Does your psu have some sort of cooling stepping feature?, So when you switch the pc off, Do the fans stay running for a short while to get it back down to room temp?

If it does, Then maybe the fan slows down a little so the noise only happens at low rpm.
#17
Any good computer shop will have compressed air, It can be pricey but it does clean stuff well.
banned#18
Iom-RF
Does your psu have some sort of cooling stepping feature?, So when you switch the pc off, Do the fans stay running for a short while to get it back down to room temp?

If it does, Then maybe the fan slows down a little so the noise only happens at low rpm.


The fans stop when the system is turned off. They do take a few extra seconds to stop spinning...obviously.

I can leave the system on all day and the fan noise will not happen, but if I leave the computer turned off for a certain amount of time and put it back on... Puzzling.
#19
Aion
Where the heck would you buy a can of compressed air? No-one I've asked seems to have a clue. :p

Tried turning my hover on max and moving it around the outside of the fan vent. It removed lots of dust, but sadly didn't fix the noise.

Anyway... If the problem could be cured by removing the muck inside, surely the noise would happen 24/7, not stopping (lke it does) if I turn my computer off fully?


Maplins is where I normally get it if buying locally.

I would assume it's something down to heat that's causing a part to expand or similar and push against the fan when it's not supposed to. I have come across similar cases to yours although the other way round, noisy at start up and then settle down after a few minutes.

John
banned#20
It isn't the PSU causing the noise (thankfully) - It's my 9600 Pro. Should've checked straight away instead of assuming...

The good news is I've identified the noise and attempted to clean the fan. The bad news? Turning my computer off doesn't seem to stop the noise anymore.

Does anyone would I be able to buy an equivalent card on the cheap? Don't want to spend much on an old PC.
#21
[SIZE=2]How about something like this - seems extremely cheap for what it is, much better than the Geforce 5 series plus it has DVI out:[/SIZE]
[SIZE=2][/SIZE]
http://www.ebuyer.com/UK/product/104734

The 6200 should offer similar performance although this one has no fan - it's entirely passively cooled. Are you doing much gaming on the machine?

John
banned#22
****, something seems wrong - Video files are playing like the monitor is displaying a lower resolution than they should, like they're the picture has become less detailed. But, my desktop text and all looks like it should at 1440x900...

I removed the graphic card to clean the fan, not thinking to uninstall the drivers beforehand. Already tried to removing the drivers, restarting and reinstalling without any luck.

Help? >_<
banned#23
And, to make matters worse, I can't get games to display at all - The screen is completely messed up when it switchers to the game.
#24
Re-seat the GFX card.

Make sure the edge of the card that goes in the slot is clean. If you have touched this it may be dirty and salt from the sweat on your hands can cause problems in the future.

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