Asrock 939dual-sata2 no mouse in 6.5 32bit

Sorry Guys for my bad, bad English!
I love Mepis but with last release of 6.5 32bit, if i make a fresh install and tested many time (6.5 rc 1 - 2 -3 -final and 6.5 0.2 32bit) I have no mouse recognition and stop at first login, only key-board work.
Live cd work great! but after install mouse stop! I have test ps/2 and different usb mouse with same isuue
Luckily I have upgrade successfully my 6.01 32bit to 6.5 final and work great, I have also in multiboot by bios for my 4 hard-disk Mepis 6.5 64bit and Ubuntu Feisty 7.04 32bit final - all work great (also Win XP and Vista Ultimate ).

I don' know if this problem is motherboard related or not?

This is my old topic in Mepislovers forum:

http://www.mepislovers.org/forums/showthread.php?t=5403

Big mystery!!

LOL