http://www.outdoorlanternsonsale.com/led-cap/
Why did the LED lights flash?
Why is it everytime when we turn on the mains to the PC, the LED lights for the Num Lock, Caps Lock and Scroll Lock on the keyboard will flash momentarily?
What happened? I mean, the PC is not turned on yet. Only the switch of the mains.
Most systems these days are soft off, the switch doesn't disconnect the mains and parts of the system stay on waiting for a wake up signal which can come from the on switch, or modem, or keyboard or mouse, or ethernet card depending on the BIOS settings.
How much power the PC takes in the above state can be quite variable from about 20W on some old ones down to a fraction of a watt on the most recent high quality machines, so best turn off at the mains.
When you turn the mains on, the motherboard and power supply will go through a little check routine, partially powering up, checking what peripherals are connected, checking the fans will spin etc. then it will drop back into the suspend state.
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