Problem in accessing BIOS ?

Sir, I am facing a problem in accessing BIOS, this it the major problem for me which i 've ever face. I can NO longer enter the BIOS or the F-8 "Quick Boot" feature of my Asus A8V Deluxe (skt.939) or even the (press TAB) BIOS message". In fact, I lost all the PS2 keyboard functions as well! After that I have tried another PS2 keyboard with exactly the same result then i connected a USB keyboard and still could NOT enter the BIOS, nor the "Quick Boot"! The keyboard is working/typing well but still can't get solution for it ! So, plz help in this I'll be really thnkful to you .........