My computer's motherboard got toasted so I replaced it with new one.
Everything is still attached just like before. The hard disc(with windows XP installed), CDROM, same 1gb DDR RAM(checked the new motherboard's compatibility and it should work fine).. etc.
Now, whats interesting is that I checked CMOS setup and nothing was wrong.
USB support/legacy support, blah blah were all enabled.
Keyboard works before it loads Windows XP. I can navigate through CMOS setup and everything.
Once it loads Windows XP, it shows "please reactivate your windows because your system hardware has been heavily modified since last boot".
Thats when keyboard and mouse don't work. Im assuming something is going on between the windows and USB.
THEN, I decided to just re-install Windows XP, so I put in the good old GateWay recovery CD.
I went into CMOS setup again, made the computer to boot to CDROM before the hard drive.
Now, the computer reads the CD from the CDROM just fine, but I can't use the keyboard again once it reads it.
I have no friggin' idea what is going on. Somebody please help.