I tried to update Safari for OS 10.7.5 and it no longer works.   What should I do to revive it?

I tried to update Safari for OS 10.7.5 and it no longer works.   What should I do to revive it?

Try cleaning the lens and see if that will restore functionality to the DVD drive.  Use a DVD lens cleaning disk, if you have a can of compressed air, shoot some into the slot or wrap a fine microfiber cloth (eyeglasses cleaning cloth)  around a business card and insert it gently inside the slot.
If no success, make an appointment at an Apple store genius bar and get a free diagnosis from them.
Ciao.

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