[ubuntu] USB stick fails to boot occasionally.

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http://ubuntuforums.org – Hi all, Config PC-1 AMD Core 4 RAM 8G PC-2 AMD Core 2 RAM 4G I run; # fdisk -l to find the device of USB stick then run; Code: # dd if=/path_to_ISO/.iso_image of=/dev/usd_stick to install the ISO image on the stick. But the stick works to boot sometimes and fail another time. Same on both PCs. It just hangs there. Please advise how to fix this problem? TIA B.R. satimis (Hardware)