Grub Rescue: no such partition

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http://www.linuxforums.org – My computer does not have a working CD rom drive, so I had booted from USB (used UNetbootin to make the USB) to install Ubuntu initially. I had Ubuntu working on my laptop (Gateway 7330gz), started messing around with it, and decided I wanted to start fresh again. So after searching the web for a how-to on reinstalling I thought I understood that I should hide or delete the partition that was selected to boot from. Now, after deleting this partition, when I boot this is all that comes up: GRUB loading. error: no such partition grub rescue> My CD rom drive does not work, and for some reason it won't read from the USB anymore, so I can't boot from anything. The only commands for the rescue mode that I've found to work are ls and set but they are the only two I know so far. I'm hoping there's a way to manually tell it to boot from the usb from this rescue mode. When I type in ls i get: (hd0) (hd0,5) and when the usb is plugged in it adds (hd1) (hd1,1) When I type in set i get: prefix=(hd0,1)/boot/grub root=hd0,1 Pllllleeeeeeaaaaaseeeeeeee help :) (HowTos)