PC won’t turn on with beeping sounds

Hello people,
I hope you guys can help me about my computer. We have an old computer with very low specifications. The computer was still working yesterday and my brother was still able to play a game using it. But this morning, when I tried to turn it on, it cannot display any picture on the screen and I can hear a "beep" "beep" sound on the CPU.
Can anyone please help me?
