On 2009-02-06, John Fields wrote:
On 6 Feb 2009 08:47:28 GMT, Jasen Betts wrote:

On 2009-02-02, John wrote:
I would like to change the led's in a old pc I recovered amber=power
green=hd from there factory color to different colors like blue and super
red led's.

I use to play electronic hobbies years ago so I’m concerned that if I
just solder the defferent color led’s to the leads I might fry
something.

powersupply for the existing LEDs is most probably 5V through a series
resistor, so just replacing the leds should work. the new leds may not
light to full brightness but will probably look good none-the-less.
There's no risk of damage to the PC by this modification as long as you
take due care.

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Bad advice.

what can go wrong?

He needs to _know_ what the supply voltage is and the Vf and If of the
LEDs he wants to use before he can proceed with the modification
intelligently.

we're talking PC assembly here, intelligence isn't really needed

the motherboard already has resistors for the existing LEDs changing
in higher voltage LEDs isn't going to damage anything.