After twelve or thirteen years of near-perfect 24/7/365 operation (only ever needing to swap out a power supply where Teapo did its magic), my trusty old 2.8 GHz Celeron system (aka Northwood P4) has suddenly gone from dead quiet to flogging the crap out of its fan. As in, while sitting with CPU temperatures under 30°C for several days it randomly jumps from 2400rpm all the way to 3000-4000 and then stays there sounding like a jet engine until power off, never stepping back down at all!
Right now it's on 3750rpm and staying there while practically idle.
The insides are spotless with no dust or anything (having recently been cleaned trying to find the problem), the heatsink has new silver paste on it and there are no bad caps in either the PSU or the mainboard. The heatsink clips are on tight and the CPU is not overheating in the slightest (at 100% load for five minutes straight the CPU goes up to 37°C).
Additionally, all three fans speed up at the same time (CPU fan, rear case fan and PSU fan). If I deliberately try to slow one down with my finger, all three slow down and then speed back up - or the system itself will forcibly speed them up even more!
Fan1/PWM1 in SpeedFan is the CPU fan, I can make it run faster but never slow it down more than what it originally was - I can even set PWM to 0 and it will still run at the same speed. All fans are 3-pin fans except the PSU fan which has 2 pins. Fan2/PWM2 has absolutely no effect on the rear fan aside from showing the RPMs, and Fan3/PWM3 is an unused connector without a fan. There also doesn't seem to be any fan settings I can change in the BIOS either (Award/Phoenix).
Right now it's on 3750rpm and staying there while practically idle.
The insides are spotless with no dust or anything (having recently been cleaned trying to find the problem), the heatsink has new silver paste on it and there are no bad caps in either the PSU or the mainboard. The heatsink clips are on tight and the CPU is not overheating in the slightest (at 100% load for five minutes straight the CPU goes up to 37°C).
Additionally, all three fans speed up at the same time (CPU fan, rear case fan and PSU fan). If I deliberately try to slow one down with my finger, all three slow down and then speed back up - or the system itself will forcibly speed them up even more!
Fan1/PWM1 in SpeedFan is the CPU fan, I can make it run faster but never slow it down more than what it originally was - I can even set PWM to 0 and it will still run at the same speed. All fans are 3-pin fans except the PSU fan which has 2 pins. Fan2/PWM2 has absolutely no effect on the rear fan aside from showing the RPMs, and Fan3/PWM3 is an unused connector without a fan. There also doesn't seem to be any fan settings I can change in the BIOS either (Award/Phoenix).
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