i am looking to install some LED lights into my case and power them from the PSU, i recently modded my case to include a view window and engraved my schools logo into it but i want more light to illuminate the case and was looking for guides to install multipul LEDs into the case it seems that my last post about this was not asked correctly and people thiougth i ment mod the actual PSU, to add leds to it

Using a spare molex connector you will need to determine if you want to use 12v or 5v then you will need to install a current limiting resistor in series with the LED's.

Molex conector is as follows
yellow= 12v
both blacks=ground
red=5v

depending on how many LED's and what colour LED's, the resistor you use may differ

This site may help
http://www.kpsec.freeuk.com/components/led.htm

This may also help with calculating the resistor value
http://led.linear1.org/1led.wiz

Those are both really good links.