Something I noticed from the OP's description on the first page: it sounds like he maybe connected a power connector from the PS to the north bridge fan header on the MB. That could definitely fry things or make things not work.
OP: It sounds like there are at least 3 issues:
1) MB not mounted correctly. You will need to take out the MB and make sure there are standoffs matching each screw hole in the MB. Also, remove any standoffs under the MB area that do not match screw holes in the MB.
2) Power cables not connected properly. The MB manual and graphics card manual will have instructions (and almost always photos) showing what power connectors to attach where.
You need to make sure that ONLY the following wires from the PS are connected to the MB:
a) 24 pin main power cable. Some PSs provide this as 20pin & 4pin connectors that should snap together to make the 24pin connector. In that case, make sure you have the correct 4pin connector, as there is at least one other 4 pin connector.
b)4pin "ATX12V" power cable. This plugs in at the edge of your MB next to the CPU. Some PSs have two of these connectors (for MBs with side-by-side 4 pin connectors); for your MB, just use one and tie the other out of the way.
Your graphics card will need the following wire connected from the PS:
a) 6pin "PCIe" power connector. Your PS should have at least one of these. The video card package includes a Y cable with one of these - DO NOT use it. That is only for use if your PS does not have a PCIe connector.
Finally, your CPU cooler's power connector needs to be plugged into the 4-pin CPUFAN power connector on the MB. NOTE: the CPU cooler DOES NOT get connected to the power supply, just to that MB connector!
3) CPU cooler issue: many MBs, as a safety feature, will not turn on if they detect the CPU cooler's fan spinning too slowly or not at all. Therefore, it is important to plug the CPU cooler's fan into the CPUFAN connector, not the NBFAN or other connector.
Also, many aftermarket CPU coolers have fans that spin so slowly, the MB BIOS thinks the CPU cooler fan is not working properly. Therefore, it's always best for novices to first install the OEM CPU cooler, and worry about changing to a different cooler later.
Here's some info on assembling a computer:
http://forumz.tomshardware.com/hardware/modules.php?name=Forums&file=viewtopic&p=1184072#1184072