The I/O shield on my computer cases are removable.
There seems to be a standard of sorts, so your I/O plate
may be removable as well. It is a compression fit:
http://web.archive.org/web/20021201...mfactors.org/developer/specs/atx/atxio_11.pdf
In this picture, you can see that a replacement I/O plate is
included in the motherboard box. Remove the old motherboard.
Pop out the old plate (be careful not to cut your fingers).
Install the new plate. When the new motherboard is installed,
it should hold the plate in place so that it cannot escape.
If you put the plate on backwards, it'll pop out on you.
http://images10.newegg.com/productimage/13-131-478-04.JPG
HTH,
Paul