I just put together a brand new PC build with all new components. In the middle of a custom install of Windows 7 on the HDD (the system only has one 1TB 7200rpm toshiba HDD), the installation screen went blank and the computer restarted. After restarting, the monitor displayed bootdisk mgr missing. So I went into my BIOS and had it boot from the windows install disc first and tried to re-install windows, but now the Windows installer isn't recognizing my HDD. I also tried switching the drive to a different sata port, but that didn't help. Finally, I tried setting the drive to AHCI mode in the bios, but after restarting the monitor only flashed a white underscore in the top left corner... So needless to say, I'm pretty worried and don't really know what to do at this point. I turned off the computer and haven't touched it since. I should note that this was my first custom-built PC. I am fairly sure that everything has been installed correctly as I am able to get to the BIOS and it recognizes the HDD and Optical drive and everything else seems to be up and running properly, but if this is a hardware issue, I would like to try to find out ASAP so I can return the parts. I can provide more specific information about my system's specs and the situation if needed.