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Whenever the power goes off and the PC starts to draw power from the UPS batteries, I notice that the PSU starts making a strange crackling sound as if a very heavy transformer is at work. The strange thing is that when the PC is powered from the mains (the power is still going through the UPS, but obviously isn't coming from the battery), this noise gets significantly lower and is barely audible.
Also, when running off the batteries, even if I turn the switch at the back of the PSU off, I can still hear that crackling noise, though it's very faint, however, when I power it from the mains, there's absolutely no noise at all.
The PSU I have is an ASUS P55GA 550W and the UPS is an Ablerex 1000L if it helps.
It's interesting to note that I didn't get any such noises from my previous 350W PSU, but then again that cheap Chinese PSU didn't have any safety features like Active PFC in it, so I'm thinking the UPS's output is bad and the PSU is somehow trying to correct it.
Any ideas?
Also, when running off the batteries, even if I turn the switch at the back of the PSU off, I can still hear that crackling noise, though it's very faint, however, when I power it from the mains, there's absolutely no noise at all.
The PSU I have is an ASUS P55GA 550W and the UPS is an Ablerex 1000L if it helps.
It's interesting to note that I didn't get any such noises from my previous 350W PSU, but then again that cheap Chinese PSU didn't have any safety features like Active PFC in it, so I'm thinking the UPS's output is bad and the PSU is somehow trying to correct it.
Any ideas?