Serial post and Front USB

Opliplex  GX280 SD

I encountered 2 problems that I'm having a h... of a time finding my way through.

1. The serial port plugin on the back doesn't work. I have gone into bios and check everything and the only thing I can see that might pertain to it is that in auto mode it disables Com port 3. When I go into Windows system device manager it also says that Com port 3 can't startup. Error 10. Checked resources and IRQ's and made adjustments to remove conflicts. Still Error 10 with no conflicts. Reinstalled drivers with no avail. I'm a little lost now. Anyone have any input that would be appreciated. Thanks

2. The front USB's are not working or recognizing anything plugged in. I have looked inside to make sure all connections are made and everything seems to be plugged in. Not sure if this is linked to the above problem or not. I would imagine so. Any feedback would be appreciated.

Like I stated before. The computer is an Optiplex GX280 CD

Thanks for your time