So the dell 990 Front Io Cable Error it annoying so lets fix it.
2.5 to 3.5 Inch ide adapter
soldering iron, flux and solder
Step 1: The Fastest Way
You can modify the dell plug from the front io panel by taking the dell plug and just cut off the end, strip and twist the correct wires together using the diagram.
Step 2: Cutting the Fat
So if you are modifying the 2.5 to 3.5 ide adapter the first thing to do is to remove the rubber cover on the adapter.
two find a cutting tool like Dremel or a small saw and file
cut the adapter down to 17 pins across like this
Step 3: Jumping the Points
Using this diagram you can solder the wire to the points, make sure that the wires are on the adapter in the right places or the thing will not work
Step 4: Changing the Hd Audio Plug
using the tip of a knife or a small flat head screw driver lift up the tabs on the hd audio plug and remove the wire then put them back in, in the right order using the diagram
Step 5: Where to Buy a Finished Part
Check back in a few days or weeks, i am waiting for some stuff to come from china, so i can make some of these adapters there will be six for sale on ebay.