2 CD ROMs not working

Hello,
I got a comp that was bound for the techs grave. I borrowed some parts from a friend and built the computer back up. Most of the parts were used but connecting everything up, everything seemed fine but 2 CD ROM s, one that was originally there, stopped working. I thought it was the motherboard that's the problem but I haven't got another motherboard that I can prove that theory. I'm stuck cause I can't install an OS, tried using a USB stick to install, the computer stares at you (Doesn't do anything). Please help asap.!!