Re: Preparing USB Memory Stick for Booting 12.04
If you can boot the install CD to a live system, does Startup Disk Creator from that make a bootable USB stick? If you use the option in Startup Disk Creator to format it, make sure you format the partition and not the device (for example, format /dev/sdb1 not /dev/sdb).
If you formatted the entire device (instead of partition) or wrote an iso directly to the device, you can use gparted to create an msdos partition table and FAT32 partition.
i5 650 3.2 GHz, 8 GB, nvidia GTX 550 Ti @ 1080p (year old GT 430 began freezing) and assorted other computers