Thanks everybody for replying. I checked almost everything you guys suggested and at last I found that it was due to a BIOS's bug. After I flashed the BIOS to the latest version, everything goes OK. Thanks again! FYI: http://www.tyan.com/support/html/b_s2466.html TYAN Tiger MPX ( S2466N-4M ) V4.06 New features and Fixes : Fixes bios resetting during reboot issue. Fixes hang on shutdown issue when no keyboard is present. On 2/23/06, Tod Merley <todbot88@xxxxxxxxx> wrote: > Hi James! > > I would be doing the following: > > 0. Making sure I am using the proper procedure to save the settings as I > leave the CMOS setup program. Some have the ability to exit without saving > permitting the use of the settings one time only. I would make sure that I > save and exit. I would also look at any CMOS security settings just in case. > > 1. Reading the MB manual with specific attention concerning how the CMOS is > powered and controlled. I often find these PDF on the web if they are not > in hand. >[...] -- Best regards, James He