Pc is on, but dont show desktop if i turn off the external tv card

my pc is turn on & i'm watching tv with external tv card (gadmei). but when i turnoff the tv card, my pc doesn't show the desktop. pls help me.
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More about dont show desktop turn external card
  1. Did you exit the program you use for tv first?
  2. i dont remove the hardware, i just turn off the tv card when my watching is finished.
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