Q: MacBook Pro having CD-Drive issues

I have a MacBook Pro 13-inch Mid-2012.

My CD-Drive had issues in the past where it started ejecting disks automatically but used to accept if I kept trying at 3rd or 4th time.

But now, It rarely accepts any disk and mostly eject them out after making some weird sounds for 15-20 seconds.

Sounds are like it is trying to run and read it but fails after 4-5 seconds. This 'trying' sounds repeats for 3-4 times and finally the disk is ejected.

As far as i remember, i'm having this problem after replaced my hard drive. when the laptop was closed after replacing the hard drive, it wasn't screwed properly and one of the edge of the back plate of the laptop is kind of loose from the cd-drive end which might be causing the problem.

Please Help !!