hi, i have home made pc that i built in march 2006. it's based on asus p5rd1-v. two 100 gb hard drives, 1024 mb ram, dvd-r, cd-r, modem, and nic card. it has windows xp-pro. the pc was working ok until recently. when i booted up, the motherborad logo used to appear for a couple of seconds and then go away, and the windows xp would start. now, the motherboard logo appears and stays on without going further. i have to turn off the pc, and turn it back on for it to go normally. and after the motherboard logo, it gives a message that "could not start overclocking, f1=setup, f2=load defaults". i have also noticed that my memory that used to show 1024 mb in "my computer" property, now shows 960 mb. somehow i have lost 64 mb of my ram. the ram sticks are 256, 256, and 512. sometimes when i turn the machien on, a long continuous beep sounds and stays on. if the motherboard battery goes bad, could it cause this? can anyone explain what this probelm is caused by? thanks.