lions,

Not a lot of information to go on.

Pressing F1 to continue boot generally indicates hardware changes or problems. Or that the CMOS battery is getting weak.

If your BIOS boot is slower than normal I would replace the CMOS battery.

See
http://www.pcguide.com/ref/mbsys/bios/compCMOS-c.html

Others will follow to clarify and correct.

Bill