Psu

1) Insert 20/24 Pin Power supply cable from SMPS in the 20/24 pin Female slot generally on right hand side to RAM.
2) Insert 4 Pin Cable from SMPS in 4 Pin Female slot generally near CPU.
3) Insert 3 Pin cable from cooling CPU Fan near available slot from CPU.
4) Insert IDE Data cable in IDE1 slot connecting to HDD
5) Insert IDE Data cable in IDE2 slot connecting to CDROM
6) If SATA select first slot from top to connect HDD and bottom slot to DVD ROM
7) Insert FDD Data Cable in FDD slot to connect FDD.
8) Insert 4 Pin Power cable for IDE from SMPS in HDD and CDROM, ensure Red color will be in parallel with Data cable.
9) Insert SATA power cable from SMPS in HDD.
10) Connect power cable from additional cooling FAN with SMPS 4 Pin power cable.
11) Check pin connectors near CMOS Battery, insert power switch, reset, power led, HDD led, speaker cables coming from cabinet as indicated on Motherboard.
Any query pls. revert.
Thanks.

Hmmm.... mainly you have:
-20 or 24-pins connector, that is unique and goes directly to motherboard (powers motherboard and its components)
-4 or 8-pins connector that powers CPU
-the rest would be connectors for ROM (CD/DVD/BlueRay) and HDD devices (there are: molex and sata power conectors)

If you totaly unshure, there is manual:
Illustrated How to Replace an ATX Power Supply