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I have an external fan which is connected via USB to a PC Portable tablet (Quaduro QuadPad 5016120).

When I switch off the tablet, the fan continues to run. If I take out the power supply, the fan stops.

I used the fan on my desktop PC and once switched off, the fan switches off.

Anyone know how to stop it (without pulling the plug)?

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Switch the USB port - it might be an always on port, used for charging devices when the system is on. Its often a different colour from the rest. You can often set this in bios, but switching USB ports might be easier.

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tried switching usb but no sucess – user71293 Sep 25 '11 at 8:20

This sounds like a power saving / USB charging setting most PC's would have in the BIOS.

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Any settings in the BIOS? – Yeodave Sep 26 '11 at 10:12

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