"Press F1 to continue"...Monitor shows an error message and asks to do this at every startup?

an asus P5GV-TMX/S 915 motherboard showing this error,i have to press F1 at every startup but afterwards it works normally.I 've configured cmos settings and disabled the floppy drive,changed motherboard battery but even then i've to "Press F1 to continue" at every startup.
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