There are some with digital readouts already. I think they display a number and you look this up.
Anyways if you've got a problem with your motherboard - just install windows and look in the Event Viewer to see what's up
Seriously though, if your motherboard is fucked than it relies on the lowset common denominator mechanism to get the message across (ie, if there's a memory/CPU problem you can't exepct it to execute the logic needed to lookup and display an error code) - hence the use of beeps and shit.