Hey guys so i just recently build a pc with msi z97 gaming 5 paired with 4690k and gtx 970. But the problem is sometimes my CD rom just won't show it-self on 'my computer'. And that time if i insert a cd there that wont work too. My CD rom is very old but this wasn't happening before with gigabyte h55m-s2v; its only happening with this build. So is it a faulty motherboard or a faulty CD rom? How can i identify it?