hello hyjacker this post and OPS other identical post on why F2 repeats, this is COMMON !
first take out that relic and bad large battery.
run on AC pack only, still dead?
the PC is now 9 years old
the RTC COIN CELL BATTERIES, mostly do not go past 7 years, seen 10 happen, but is not PAR,
life span is 5 to 7 years.! facts.
so replace that first,
then reset bios next.
and test on AC Pack only, until the PC runs right again do not use the useless 9 year old HUGE BATTERY, oK?
then make sure boot order in BIOS
shows HDD , in the list.
or the HDD is dead.
the coin cells dead will cause many PC
to stick at BIOS screens, after all it cant find the boot order configurations with that battery dead.
once that is cured, you can boot windows
if the HDD still works.
on some pCs you can hit F2 and it loads BIOS defaults and boots.
but after powering down, all that is lost and all this above repeats.
the service manual on your PC covers this.
but I can not find that manual anywhere...
how to replace your RTC Coin cell.?
here it is, remove any hatches to reach it.
RTC is on the bottom
see yellow blob this is your exact mobo.
this is the bottom side of mobo
open hatches on bottom of PC to gain access.
I see 1 huge hatch in our manual, at asus.
no 2 laptops are the same unless they are exact model. so learn to find it using below photo.