need help, R9 270x ... Black screen after i installed in PC.

Anan1337

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Aug 7, 2014
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Hello everyone, I would like some help with my graphics card, i bought a Gigabyte R9 270X almost a year ago and I was going to build a PC for it, but now i wanted to install to my current PC,
But when i installed it and got a new PSU, and put EVERYTHING correctly(i did try several times)
when i turn it on, i just see a black screen, but i do hear the PC is booting like normal and ALSO the card fans are working fine! , can any1 help me with this?
i can add additional info just ask.

My PC: HP Pavillion P6000 series
i5-2300 2.8Ghz
6Gb ram
Windows 8.1 Pro(installed last night, i had Windows 7 when i tested the card)
1Tb HDD
Corsair VS520(please till me if this is enough for the card..) (i also got this new and wasn't with the PC)