I have a Toshiba L505 laptop that when I boot it, the screen is black & the is an upside down L in the upper left corner. I called Toshiba & installation disk were not sent with this unit. I know the screen & HD is good because I put a Windows 7 DVD in & booted to it & it wanted to install but I cancelled. They told me it had a system restore partition on it. How do I boot into this system restore partition or how can I get this thing fixed? I do not have the product ID or installation key for Win 7 key as it is on the sticker on the bottom but is faded too bad.