I recently bought a new Compaq Presario sr1710nx with 64-bit Sempron and last week installed Centos 4.3 64-bit on it. Worked like a champ until I attempted a reboot (using "init 6") and the computer hung after finishing the shutdown. Rebooting from cold worked, but without a warm reboot I was hesitant to use Centos. Since FC5 (64-bit as well) came out recently, I tried it and warm reboots work great. So it would seem that it is a kernel/driver issue, but I have no idea where to begin. Also I'm not if additional grub boot parameters might help. I won't be in front of the machine until this weekend, but since everyone else will be gone by them, I'd thought I'd ask you guys if you had any ideas. I really would like to get back the package stability of Centos. Fedora 5's updates are driving me nuts (too many, too often and too major). Any suggestions? (I'm going to try 32-bit Centos this weekend first) Thanks ahead of time, Tarun