when i turn on pc there os no display on monitor a

  Guest 1234512379 04:30 18 Jan 2017

hi I had 7300 GS vga and when I start my computer there is no display on monitor and I have to restart comuterafter start ehen I going to play games or watching movie its freeze and sometime display goesso I change my graphic and I bought a gt 730and it happened again but there is no freeze just restart.and I change m CPU.Sometimes CMOS date is wrong is it about it? when I turn on computer yhere is a message on monitor says check the cabble but I change my Cable but still same error and ihave to restart bseveral times sorry for wrong words I cant speack English very well

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