I've never heard of shark. So I'm quite suspicious of that PSU I must say. Definitely not one of the well-known brands
around here; which is a bad sign by itself. However, is there absolutely no sign of life? No fans spinning, no lights, no beeps?
http://www.jdresearch.com/atx750N.html
Your power supply only has 1 6pin PCI-E connector.
The 8 pin connector you are plugging into the video card is an 8pin EPS connector.
The power and grounds are in different places.
Must have taken quite a bit of force as they are keyed different.
Also it is a overrated 600 watt unit at max.
The psu has a 6 pin with a 2 on the side I have used the spare 4 pin and used a 4 pin to 8 pin adapter to plug into the 8 pin and the 6 pin from the psu to plug into the 6 pin