Hello I have put a 5.5" PSone screen in the front of my comp I have an All in wonder so watch TV on it. I have connected switches to it so I can turn all the lights off when I got to bed. But I want to connect two blue LED's so I know if I have left the screen on but showing black. The screen runs on 7.5 volts which I get from a yellow +12v and a black floppy -5v. I also have a matrix orbital clone in the cover also linked to a switch. That uses a standard 12v molex. I want to wire an LCD so that when on the blue LCD is lit. The guy in maplins say I need resistor can anyone tell me how to wire up an LED to this? The LED should be 3mm. Dia's below.

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