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Cold room = PC whirs. Warm room = PC doesn't?

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My situation:
When my heating has been on and the rooms are warm, I switch my PC on and it doesn't make a loud rattling sound.

When my heating has been off, the rooms are cold. I switch my PC on and the loud whirring sound is there. I have to leave it running for a few minutes before shutting it down completely. When I reboot it back up, the whirring sound goes, like something inside the tower has warmed up enough.


My question:

What could possibly be cold enough to start whirring? It only ever happens when the room is really cold.


Any info much appreciated

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    WTT Tech Teacher

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Could be a lot of things.

Some thoughts for you:


A lot of materials will change dimensions when exposed to either warmer or colder environments, so any rotating mass with bearings will have factory set clearances that can be reduced by a colder environment....


For example:


1 cooling fans in the computer case or sited near the heatsink for the CPU

2 Fans in the power supply unit (PSU)

3 Fans on the video card (if fitted)

4 Optical drives (CD/DVD etc.)

5 Bearings in Hard Drives (internal and external)

6 UPS boxes of one sort or another


There are probably a lot more but these should give you the idea,


Cooling fans can be lubricated ( at home if you are careful and know how to do it) but don't try it on hard drives etc!



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