Compaq Proliant Server

I am using Compaq Proliant Server for providing Internet Services through
Local Area Network. We are facing serious Load Shedding Problems that our
UPS some times unable to run for one hour's load shedding so we have to shut
down the server. When I run the server again, during bootup I have to press
F1 key. How can i get rid of this step that only by switching on the
computer it should Bootup.

And Can i do something that the server should automatically shutdown 5
minutes before the loadshedding time.

Best Regards,
Shakeel Ahmad.