[syslinux] USB Keyboard

[BuraphaLinux Server]

Hello,

    My desktop machine at work was replaced and they gave me a Dell
Optiplex GX520 machine to use.  When booting from CD-ROM I use
isolinux 3.50 and the keyboard does not work.  It does work once linux
boots, and it works if I hit the F2 to go into bios before isolinux
starts.  I have searched google and the syslinux archives for
'Optiplex GX520' but have not found any reports of other people with
problems.  I searched for 'syslinux USB Keyboard' and people say to go
into BIOS and turn on the legacy keyboard support.  I read the common
problems and hardware pages on the syslinux.zytor.com site (couldn't
find a FAQ page though).

    I cannot find anything to set for the keyboard in the BIOS
(version A11, if that matters, and there is not a newer one at the
dell website to download and try).  My question is "Does anybody know
how to make the keyboard work for isolinux 3.50 with vesamenu.c32?"
This machine has no PS/2 keyboard connector, so I cannot just use a
normal keyboard.  When isolinux menu is showing the countdown, even
caps lock and num lock do not change the keyboard lights.

    I got installed ok by making a new iso that had the choice I want
as the first choice and just sitting through the countdown, but I
would like to know if there is some secret to getting things working
normally, or if this machine is just defective.  The school's
technician just says run windows and will not help.

Thanks!