Anywho I do have a ASUS motherborad
did i call that or what.
first, double, triple and quadruple check all of the wire connections in and to your computer.
dont bother taking it to best buy just yet. what model motherboard do you have? what is happening to you happened to me, so you either need to reset your cmos, or if that doesn't work, then call up asus and they'll ship you out a new bios chip. if the new bios chip doesn't work, THEN you should start thinking about taking it to best buy (but keep in mind, best buy charges a LOT and its by the hour)
from what you said, heres what i think happened. SOMEONE flashed your bios and used the asus update utility that came on the disk (which allows you to flash the bios while in windows, and most of the time ends up destroying the chip). i honestly think your brother restarted the comp after he flashed the bios, noticed it didn't work after the flash, and just told you that he didn't so you wouldn't get mad.
trust me...just call up asus tech support and they'll ship you out a new bios chip. the chip itself is free, and its like 20 dollars for overnight shipping, 6 or so for standard shipping. just try the new bios chip from asus (which comes with the latest bios update) and then go on from there (if all cables and wiring is done correctly and that wasn't the problem)
better to just order the bios chip than take it to best buy right away. plus, even if it's not the bios chip (which i HIGHLY doubt isnt the problem) you'll have a spare bios chip just in case one does end up frying.
everything you've said points to a bad bios.