Want a blurry background on Nikon Coolpix p510 but the image comes out black?

I've tried numerous settings in manual mode to obtain a blurry background:
f3.7 SS 1/1000
f4.8 SS 1/500
To name a couple
Images turn out black. It doesn't matter if I'm indoors or outdoors. I've adjusted the ISO to higher settings as well. Images are still really dark. The meter shows that it is far in the negative. I don't know how to get it to zero. Any suggestions on what could be wrong?

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How much should I rely on snapsort.com evaluations?

Just wondering for I compared the Nikon Coolpix P520 with the Nikon D3100 and it says the Coolpix P520 is better. Makes me wonder.

http://snapsort.com/compare/Nikon-Coolpix-P520-vs-Nikon_D3100

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My memory card says full but it's empty on my Nikon coolpix 775?

I'm having trouble with my cameras (Nikon Coolpix 775) memory card. I put a new card in and formatted it but the camera thinks the card is full (memory card full) and won't work. I hooked it up to my computer and looked at the memory card to see if anything is on it but it was empty. Not sure what to do next.
Thanks for the help

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