What to do with an executable file that simply doesn't execute?

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http://unix.stackexchange.com – I downloaded the Linux executable for Unetbootin 494, and now I'm trying to run it. As root, I made it executable and attempted to execute it: chmod +x unetbootin-linux-494 ./unetbootin-linux-494 Nothing happens and no output is displayed. ps -e | grep unetbootin shows nothing either. The file's size looks right (4.3 MB), although I don't see a checksum on sourceforge with which to verify it. I'm running it on my /home partition (as root, though), so the filesystem isn't non-executable. How can I execute this file, or at least debug the problem further? I'm using Debian x64. (HowTos)