Black screen after graphics card install (Nitro R9 380)

Currently running a radeon 6850 and decided to upgrade to the Nitro R9 380, when I took my old card out and replaced with the 380 I only get a black screen and the power save mode message on my monitor. I cant figure out the onboard graphics thing because my 6850 is the only thing I see under device manager and in advanced bios there is no setting to disable onboard graphics. I installed the drivers that came with the 380 off of the disc and that didnt help either ...anyone know what I am doing wrong? Baby step walk me through the process because Im somewhat a novice these days lol, my other graphics card continues to work when I plug it back in so its got to be a driver issue unless my motherboard cant handle the new card which I find unlikely

yeah I thought it was supposed to be plug n play too, I connected the 6-pins, both of the fans on the Nitro are running just fine on start up, it just that the screen remains black, its got to be a driver issue Im thinking

Yeah I have no internal graphics card so its complicated, I might have to call Saphire and see what they say, it seems like a lot of people have similar problems especially with Windows 7. I am going to try a few more things and than maybe upgrade to Windows 10 and try again, Im just hoping its not something like my motherboard but I dont think it is because my old card still works its just not as strong as I would like it to be

I am pretty sure its 525w

Talking about PSU, actually the most important is how many ampers is provided on +12V rail, so check this in your PSU specs.
For example my Corsair HX750 provides 62A on 12V rail and that would be more than enough for your new GPU.
I think even 50A should do just fine.

Yeah Ive been lookin at a new psu, I think mine is strong enough to push that it pushes the fans but nothing else

figured it out, there was a tiny dip switch on the video card, I switched it and it took right off