well, i have searched about it tons of times but no avail. I formatted the flash drive in fat32 xcopied everything, set usb as first boot media and still it shows OS not present.. I have SanDisk cruzer micro 4GB, Asus M4A785T-M, AMD Phenom x4 B55. plz help!
xcopied? That's windoze talk.
Do you have a working Linux install to use? How about Trinity or System Rescue CD?
Use the linux command line and do it right -- see references at this site , specifically from CrunchBang, which cannot be installed using UNetbootin!
Also, check out ULTILEX, FYI, and try out TinyCore!
You may find something useful at one of these site, if you look!