USB keyboard and mouse hang all of a sudden

[iinfi]

hi have a AMD 64 x2 Dual Core Processor 4000+ system with 2 GB RAM
i have installed RHEL 5.3 on this system.

i use a USB key board and mouse.

the keyboard and mouse work normally when the machine boots up, but all of a sudden be it command line or graphical i get an message on the command line saying
localhost kernel: Disabling IRQ #11
and both the keyboard and mouse hang.
if i ssh into the system from a remote machine all services run normally. its only with this keyboard and mouse.
to restore it i have to reboot the machine.

can some one plz guide me as to what is going wrong.
the same doesnt happen with PS/2 keyboard and mouse, and it doesnt happen when i installed SUSE Desktop (with USB key/b and mouse)

[devils casper]

Toggle Legacy USB Support in BIOS.

[iinfi]

i will try this in office tmrw n let you knw
thank you.