My Toshiba Satellite computer satellite C655-S5512

My computer is saying this. Intel UNDI. PXE-2.0 ( BUILD 083) For Atheros PCIE Ethernet controller v2.0.2.7 ( 11/02/10 check cable conections! PXE-MOF : Exiting Intel pxe ROM. An operating system wasn't found. Try disconnecting any drives that don't contain an operating system. Press collateral alternate delete to restart. This is displayed on a black screen with white lettering. Well I have tried everything and nothing's working none of the buttons it only goes to the boot menu if I make it go there. Keeps asking me for a password in a blue box when I turn it on my computer. Then all this comes up what I wrote above. I factory reset it using the prompt as I'm going to use my computer again and this is all I get and I can't go any further won't let me do anything. What do I do now??? This all started because I couldn't get in my password to my sign in screen and try to factory reset it help please.