monitor goes black for a second every 30 mins or so

coconutoil

Distinguished
Jul 18, 2011
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Hi,
I have just got my new custom desktop
6300 CPU
GB 990XA-UD3
XFX R9 270X
XFX 550w Bronze
SAMSUNG 21.5 LED HD

Monitor goes black for a second every 30 minustes or so, I changed the HD cable and still the same thing. I reseated the graphics card also.
When I put the first HD cable I saw lines of purpule on the screen, then it went away, I think I was not putting the cable correctly into the graphics card.
I'm updating the windows, I already updated the graphics drive.
I don't know what else should I be doing???
Thanks

I just stressed the card with furmark for 15 mins, nothing happened.