memory changed message at boot

I have HP server running NT40. When I start up or reboot the system a message comes up “system memory has changed press F1 to continue or F2 to run configuration Utility”. Unless I select one the server wont boot up. This can be frustrating when the power goes out in the middle of the night and I get a call in the morning that the network is down. When I press F2 I’m not sure what needs done to stop this message from coming up and halting startup. Any help….