I have a Gateway NV55C. when powering on the computer it immediately goes to a Gateway screen that says press f2 to enter setup. Then it waits a few seconds and restarts by it self and continues this cycle until you pull out power cord and remove battery. When I hit f2 it will sometimes take you to the boot screen but I dont know what to do when I am there.......but I was only able to be there 2 times. Help?