loud fan noise

gromack
gromack used Ask the Experts™
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I’ve got a Dell T3400, that after being powered on for a few minutes, starts to sound like it’s about to take off, with the fans getting louder & louder. this only started after replacing the power supply, power supply was an after market one, as one from dell would have been more expensive & taken a little longer to get. I had to remove heat sink to run some of the cables for HDs (mounted on bottom of case), but made sure to use plenty of thermal grease when putting it all back together.
any suggestions?
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David FavorFractional CTO
Distinguished Expert 2018

Commented:
Likely this means the PSU replacement you used is producing a massive amount of heat.

Likely fix - replace the PSU with one producing lower heat, or increase air flow across your power supply.

Tip: Ensure the PSU sits at top of your enclosure, with all heat pulled out immediately.

Having the PSU at bottom of case means heat will rise through your entire enclosure, heating up every single component.

Can't tell you how many times I've seen this mistake.

Simple Fix: If your PSU is in the bottom of your enclosure, turn your enclosure upside down to PSU heat rises out of machine, rather than through machine.

Author

Commented:
PS is mounted at top of the case, it’s the hard drives mounted on bottom & I had to remove heat sink to run cables along back of case. replaced everything back like it was, or so I thought, fans weren’t this loud before.
Top Expert 2014

Commented:
"plenty of thermal grease"

That's not right, you use a minimum amount of thermal paste.
https://www.youtube.com/watch?v=-hNgFNH7zhQ is quite a reasonable  amount, much smaller than a pea.
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Robert RComputer Service Technician

Commented:
As mentioned too much thermal paste is not a good thing, as it can be almost as bad as no thermal paste at all. Too much thermal paste can cause the the system to run hotter, forcing the fans to run at a higher speed. I would also check the dust in the case especially the motherboard, dust acts as an insulator and keeps heat in. Use a can of air to blow the dust out of the case and especially make sure there is no dust accumulating on the fans.

Author

Commented:
cleaned off excess grease & reapplied, based off of info in the video. I also found a power supply from another T3400 & replaced that as well, once I plugged everything back in, computer powers up, fans start, etc., then it’s like I’ve hit the reset button & that repeats again & again. went back to previous power supply, tried reseating ram, pulled all power from mobo for a few minutes & nothing has seemed to help situation!
help!
Top Expert 2014

Commented:

Author

Commented:
no luck there, either. even tried pulling ram to see if I’d get any beep codes.
Top Expert 2014
Commented:
Might be poor contact on one of the CPU pads since it went wrong when you removed it. I'd pull it out again and make sure all the pads are clean and make a close inspection of the socket.

Author

Commented:
I was just coming back here to say it’s working now when I saw your last response. I pulled CPU, turned it on & it didn’t keep restarting, so I took CPU from my ‘parts’ machine, made sure socket was clean, applied a minimal amount of grease, put it all back together & all looks good!

Author

Commented:
thanks to all!

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