A4000 Hard Disk Activity Light

[ChocolateJollis]

Hello all,

I have an A4000D that's been towered up in an Elbox PowerTower. The hard disk activity light doesn't do anything... the 3-pin plug coming from behind the case bezel has one wire going to it (always has) but the pin header on the motherboard has 3 pins... wondering if anyone has any ideas.

Thanks in advance!

[Dr.Bongo]

there is definitely a wire missing from the case. All LED's need an anode and a cathode (+-) so I'd look at what is exactly connected to the HDD 'light'.

[ChocolateJollis]

there is definitely a wire missing from the case. All LED's need an anode and a cathode (+-) so I'd look at what is exactly connected to the HDD 'light'.

On the inside of the bezel, there is a small PCB with 4 LEDs for power and 4 LEDs for HDD and a 4-pin header connected to four wires (two red, one black, one white). One of the red wires, the black wire, and the white wire connect to the Elbox A4000 Zorro bus board POWER LED connector. The only other wire (red) goes to the "HDD LED" plug, which goes directly to the motherboard. I was guessing that the red HDD LED wire was hot, with earth supplied by one of the other three. There are no more connectors on the LED PCB to accept more wires than the four I named.

[Jope]

Yep, so time to iterate. Try to connect it to the center pin first, if it doesn't light up, then try either edge pin. The connector on the motherboard is symmetrical.