i have a new pavilion dv7t, and after trying to set up a dual boot system, it refuses to restart. i have 7 home prem. on the c drive, and wanted to put win 7 ultimate on the "a" drive. but after a couple of reboots, on the last reboot the computer gets to the initial prompt, and then just has a flashing cursor in the upper left corner and will not go any further. i have run memory diagnostics, hdd diagnostics, start up diagnostics and runup diagnostics and although every single one of them passed with no errors, it still will not boot. the computer is so new, that i haven't had a chance to make boot disc's yet, because i didn't have any writeable disc's on hand. is there anything anyone can tell me that can help?