Would this work?

[Demon-Xanth]

Use a green and red cold cathode light as a HD activity light.

So when the HD is active the entire case would light up.

Edit: stupid enter key!

 

[Shooters]

The only way I could see that happenning is if you were somehow able to connect the CC light to the mobo header, and even if you did do that, I highly doubt the header would put out enough juice for the CC.

 

[ubersam]

How about if you use the mobo's hd light header to activate a small enough relay to swith on the power to the CC? The relay would have to be quick and hold up to constant switching.

 

[ShadowDJ]

It sounds like an awesome idea. It probably could work. I would agree with the idea of a relay. It sounds really cool to me.

 

[fast_eddie]

an optoisolator circuit would probably work better than a relay