1080p Video cant play on my HDTV

Hello,I just bought a new HDTV when i connected to the vga with my dell tower it works great but when i play a 1080p video on youtube it lags... im so confused cuz my old old very old monitor played the 1080p normally i dont know why this happen ?

sorry for my english im from spain :)
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More about 1080p video play hdtv
  1. try connecting it via DVI or HDMI ..
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