I have a client built by kickstart running 32 bit RHEL5 that requires PS/2 mouse and keyboard (it will be running a PS/2 KVM when complete) - it works fine when built yet when rebooted the PS/2 is disabled and I cannot re-enable it. I have tried:
1) building with USB disabled in BIOS and PS/2 keybd & mse connected
2) building with USB enabled in BIOS and PS/2 keybd & mse connected
3) building with USB enabled in BIOS and only USB keybd & mse connected
4) no keybd & mse connected on build
5) changing the /etc/X11/xorg.conf file changing the keyboard0 and mouse0 to keyboard1 and mouse1 and many variations on this.

I have had no success in getting PS/2 to be recognised after a reboot. I have an error, occasionally, on reboot "i8042.c: Can't restore CTR" which looks related but I can't find any remediation. Help would be appreciated.

You're better off getting in touch with Red Hat, the whole point of using RHEL is that you pay for the support, so you take the support