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This is a discussion on PSU weird within the RAM and Power Supply Support forums, part of the Tech Support Forum category. Hi all, I have a Corsair 1100w PSU and it's never had any faults in the last 3 years. Today


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Old 05-30-2018, 05:42 AM   #1
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Hi all, I have a Corsair 1100w PSU and it's never had any faults in the last 3 years. Today I turned the power on at the wall (with the PSU switch turned off) and both my keyboard and external USB HDD both lit up ??? One is plugged directly into the mobo and the other is plugged into the case front USB port. this has never happened before, does it indicate a problem with the PSU? There shouldn't be any power coming through to anything if the PSU switch is off right ???
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Old 05-30-2018, 11:55 AM   #2
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The switch could be only to prevent the PC from starting, not stopping all power. The keyboard and mouse lighting up while the PC is off is not uncommon.
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Old 05-31-2018, 06:04 AM   #3
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Quote:
There shouldn't be any power coming through to anything if the PSU switch is off right ???
If you mean the master power switch on the back of the PSU, then correct, there should be no power output from the power supply if that switch is set to Off or 0. That is what that switch is for, to kill all power output, including the +5Vsb standby power.

But if that master power switch on the back of the PSU is set to On or 1, you will have +5Vsb power distributed to several points on the motherboard, including the USB ports.

If you are certain the master power switch is "fully" switched to the Off or 0 position, and you still have power going to your keyboard, you have a faulty master power switch.
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