My PC isn't displaying anything after installing a new graphic card

BashirBa7

Reputable
Jul 22, 2015
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4,520
I just bought a r9 270x installed everything seems fine but it wouldn't show anything(screen would just say no signal for 3 secs then screen turns back off) after turning on. I have 500W psu
I disabled/uninstalled old software.
I tried taking off the ram and putting it back

How can I fix this plz help
I have a ts140
I have windows 8 should I go to windows 7?