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Has it always done that or previously worked – could be a PSU problem ?

It just started doing it. It worked with the fan and the USB mouse and keyboard. By the way, it’s a HP Pavilion A1587C Windows 8 (upgraded from 7).

I am having that problem. I don’t know if this is situation is the same. I am losing both mouse and keyboard each time I plug my fan into a USB port. When I remove it, the mouse and keyboard resume working. Are the other USB ports in use?