In the BIOS, there is an option for self boot. When you boot it from scratch, hit the F2, or whatever key it tells you to hit, "TO ENTER SETUP". This is probably set to turn itself on, somehow. Be very careful what you change in there. You can dork stuff up if you are not careful. Change that option, if it is on, save, and get out. Then finish booting. You should be OK.