If you purchased the Rosewill 650W PSU, user manual download > http://www.rosewill....=21_14_395_1801
You have the various Manuals for reference but suggest you proceed in the following order.
If installed, remove and replace the I/O shield in the case with the one supplied in the MB box.
Alter/install fans if required.
Install the PSU.
Check carefully the stand-offs on the MB mounting plate inside the case, the number and pattern must match exactly the screw holes in the MB, no extra ones.
Install the Optical Drive.
Place the MB on a clean piece of cardboard, a little larger than the board.
Install the CPU.
Check there will be thermal interface material on the heat-sink plate (usually a pre applied pad/strips on stock cooler) or IF NOT PRESENT, APPLY YOUR OWN to the CPU.
Install the CPU heat-sink/fan.
Connect the CPU fan to the CPU fan header on the MB.
Install the RAM, refer MB Manual for the correct slots.
Install the MB.
Install HDD/s, try to leave bays empty that are close to the end of the video card when installed.
Connect the two power cable to the MB.
Install the GPU. and connect the required PCI-E power cables.
Run and connect the rest of the wiring.
If using, connect the mini internal system speaker, ensure the +/- on the plug match the symbols on the header pins.
Check over your wiring, OK/? you are ready to go.
NB. Keep all packaging, receipts and any bits left over,