Hello Pedro 3,
For one thing: If you removed the CPU (and/or RAM modules) from the motherboard, then yes- you will definitely get a different "Beep Code" than the one you originally got.
BIOS beep codes relate to the installed hardware, so if you change any of that hardware, you will get different beep codes.
You said that you originally got 3 beeps; did those beeps repeat at a certain interval, or did you just get 3 beeps and nothing further?