If you have reset your BIOS to default settings you may have to go back in and change your boot order. It sounds like its going though the default options one by one, network boot, DVD Drive, etc. You may want to run a diagnostic on your hard drive to see if it is OK. Your Toshiba may have built in diagnostics or you can go to the drive manufacturers web site and get one. If you use the drive manufacturers utility look for one that will let you create bootable media. You should be able to get the make and model number of your hard drive from your BIOS screen.