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Case fans running ALL the time?
Hey all - I have a bit of an odd issue. Just finished building a PC for a young guy. His mobo died, so we ordered a replacement - all his other parts are being re-used.
The odd issue is that the chassis fans spin ALL the time, even if the system is shut-down? Even if the system is off, as long as the power switch on the back of the PSU is set to 'on', the fans spin constantly at seemingly a few hundred RPM (like...200RPM, maybe?)
Once the system is turned on, they spool up to their usual 'low temp idle' speed of like...500rpm...and work perfectly fine. The whole system, in fact seems to work perfectly fine except for this one weird niggle.
One fan is connected directly to the motherboard (a brand new ASUS B85M-G) and two of the case fans are connected directly to the PSU via molex adapters. The power supply is an older Thermaltake TR2 600w.
The CPU fan and video card fan do NOT spin unless the system is actually powered up and running. Not sure if the fan in the PSU spins when the system is off and the PSU switch is on or not - will check that after and report back as the system is in the middle of a Win10 upgrade at the moment.
I've never seen this before - is there a reason this may be happening? Thanks!
Last edited by Darkstrike; 05 Mar 2020 at 18:50.