for a while now when i reboot my system or start it up ( which i almost never do , i just usually leave it on) I get a hardware monitor error on boot up, when i go into the bios i have a vcore voltatge of 1.36 which is in red, I usually just hit f1 to bypass this, is this bad to do? any ideas why this happens? Do i need a new mother board?

I have a P4 2.4ghz computer and 512 mb of ram and a asus board i think.