Toshiba Satellite P855 won't let me out of reboot and select proper boot device or insert boot media in selected boot device and press key.  I can not, I repeat I can NOT get into BIOS.  No matter what key(s) I press it just scrolls "reboot and select proper boot device or insert boot media in selected boot device and press key". I replaced hard drive , same thing.  Now it had Windows 8 and upgraded to 10. I have a Windows 7 disk.  Do I NEED a Windows 8 or it matters not    Thanks 
				
			
				
		