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Light in tower stays on after PC turned off--Normal?

last year

Dell 3668

Windows 10


Even after the monitor and the light on my keyboard above the NumLock go off, a light stays on at the bottom of the tower for around 45 seconds. It can be seen at the lower left through the little square grill where the power plug is. This happens whether I am connected to the Internet by Ethernet or WiFi. It is only recently that I happened to be in a position where I would notice this, so it could have been going on for a long time. Is it normal, or could something bad be going on, like a hacker secretly sending commands to the computer? Thanks for any information re this.

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