I'm trying to recover GRUB after installing Windows 7. I installed Ubuntu 12.04 first, then installed Windows 7 so I lost the GRUB at startup. Made a USB stick with Ubuntu to boot from, I get the menu tell it to start and it takes off but then gets stuck. The last line showing on the screen is: ata10: PATA max UDMA/100 cmd 0xc800 ctl 0xc480 irq 17 or this: [4.793048] scsi9 : pata_jmicron Then it just gets stuck there and the screen flashes from time to time.