My uncle does not remember his password for Win10 (or any pw for that matter). System seems to be in Hibernate (type) mode as log in screen comes up automatically in a second or 2. I need to get to Bios so I can boot from DVD/CD to work around lost password issue. Laptop is Gateway NE5612Ru model upgraded to Win10 from Win7. How can I bet to Bios to change boot mode to DVD/CD?