I recently bought a Powercolor 7870 Myst ed, when I plugged it in for the first time and turned on the power the fan was slow to spin until it turned off for about 1-2 seconds then turned on again. I'm also having a black screen, from the moment I turn the PC on it's all black. I tried mobo only and it booted, I tried my old graphics card and it booted also. I tried a VGA and an HDMI cable but still nothing.
Maybe it's just a faulty card. BTW here are my specs.
Seasonic S12II 620W,
MSI H61M-P31 (G3) Mobo
Powercolor 7870 Myst ed (My old one is a 550 TI)