im currently working on my brothers computer. its an older windows xp with an athlon 1.3 single core, 386mb 133 ddr ram, and a ak74-ec motherboard. i was trying to reformat and reinstall windows when i happened to press the wrong button on startup and it brought me to the setup menu. so i changed the 1st boot sequence to cd drive. i disabled the floppy boot cus i got rid of it. and i changed the memory clocks to 133 instead of 100 cus i thought it would improve its performance. so i save and quit and the com shuts off. when i went to boot it back up it beeped 3 times then shuts off before it even gets to the first info screen. i kept trying it and it actually stayed on once but the beep is now a continuous note. not to mention the monitor wouldnt recognize the computer. i tried unplugging it and turning it off and back on but nothing works. i would like to know how to get to the setup screen again and revert the settings back to how they were. is there a way to get around that or a way to fix it? please and thank you.