Hello All, My laptop (Dell Studio 1550, Windows 7 Home Premium 64 bit) just gave me the black screen upon start-up. The Iolo System Mechanic had defragged the registry, I think, and it seems that the process had damaged my laptop's registry. I've ran sfc /scannow with no issues, but the memory diagnostic test froze. I am now running System Restore but it too returns a black screen upon completion. It seems from prior threads that a clean re-install is necessary. Would like to know if this is indeed the only solution, and if so, how do I go about re-installing without an installation CD (Dell never sent one, and I had bought the laptop abroad while I was in college). Thanks!