Ripped CD in iTunes library will not sync to iPod
I have ripped a number of purchased CDs into my iTunes library. I don't have a problem viewing or playing these albums in iTunes. However, the problem is that these albums won't sync to my iPod. I don't know how to fix this problem? Someone mentioned to me that it may be an authorisation issue. My pc is authorised because I have purchased music from the iTunes store and sync this to my iPod without an issue so I don't understand why the ripped CDs won't do the same. How do I get these albums onto my iPod? Please help me because this problem is driving me crazy! Thank you. (I am using a HP pc with Windows 8 and an iPod Touch 5th gen).
iPod touch, iOS 7.1.2