Mac Mini DVD-Rom doesent Read or Write DVD.

Taken from the acer support website.
" Optical media drive 8X DVD-Super Multi double-layer drive:

• Read: 24X CD-ROM, 24X CD-R, 24X CD-RW, 8X DVD-ROM, 8X DVD-R, 8X DVD+R, 6X DVD-ROM DL (double-layer), 6X DVD-R DL (double-layer), 6X DVD+R DL (double-layer), 6X DVD-RW, 6X DVD+RW, 5X DVD-RAM
• Write: 24X CD-R, 16X CD-RW, 8X DVD-R, 8X DVD+R, 4X DVD-R DL (double-layer), 4X DVD+R DL (double-layer), 6X DVD-RW, 8X DVD+RW, 5X DVD-RAM

" This model of computer does not have a blu-ray drive unless you got a third party upgrade. In this case, you will need to track down special drivers, which can best be done by whomever sold you the drive.

If your Drive is a CD-Rome drive, surely it cant, for the drive cant read dvd disc. Replace the drive of yours with DVD-Rom or DVD-RW in order to play dvd disc, DVD-RW simply has the added capablity to burn on DVD discs

CD ROM drive will play only 700 mb CD disks(normal CDs)...and not play DVD disks...u need DVD ROM drive to play DVDs....there is a big difference among both in it's function.
a DVD drive "may" play both DVDs and CDs....
but
a CD drive will "only" play CDs

If you can, open the cd drive and clean the cd read/write lense with dri cootton wool (preferebly used for madical purpose) I hope it will work

change the lens of DVD. its a common problem. due to over use.

1st step; Acquire/buy a cd/dvd rom drive cleaning tool kit from your local pc store.
2nd step; Install a dvd coder/decoder software, try Power DVD player software it has a trial version
3rd step; After installing the DVD coder/decoder from Power DVD player try playing a dvd movie rom disc it should work/play... hope these tips help ;-)

I have the same problem!

your DVD ROM's lens has became weak.
and it cannot be repaired.
But if you manage to open the DVD ROM clean the dust in it & it will start working agaain but be careful remember that no power should be attached to ROM.
pls rate me
thankyou

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  Internal drive (double layer) 

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External drive (double layer)

•   Write speed: 8x double layer, 20x DVD±R, 48x CD-R

•   Rewrite speed: 8x DVD+RW, 6x DVD+RW, 32x CD-RW

•   Read speed: 16x DVD-ROM; 48x CD-ROM

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Assuming you have tried different makes of cd or dvd disks, it's a classic drive failure problem where the laser can no longer burn or read dvd's, but may still be able to read cd's only. You will have to replace the drive, they are quite inexpensive, and very easy to fit.