Hey, I just recently purchased a gigabyte 7870 2gb gpu and a corsair cx600 psu since the card required at least a 500 watt psu...i installed the psu and the card and the computer started but the monitor said no signal and went to sleep...i need help im pretty sure everything is plugged in right...the gpu seems to be getting power because all the fans are spinning...i need help...
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Have you disabled the integrated graphics? Try doing that first from the bios. If the problem is not fixed reset the ram settings and try again also update the bios.
you need to publish system configuration. If your motherboard has onboard graphics function, you can have to disable it via BIOS.