iMac 27 inch

+1 a 2015 27" is too old and should be replaced. Apple considers it obsolete meaning it will not run current versions of Mac OS and parts are no longer available. To be honest a 24" will be much more powerful and faster than your current machine. Remember to backup the old machine using Time Machine and then when the new machine arrives, please follow the instructions in Setup Assistant and Migration Assistant. Buy your adapters from Amazon quickly so you have one available to use when the new machine arrives.

Finally please make sure your new 24" has at least the same amount of storage as the old machine, so if the old 27" has a 1TB drive, get a 24" with a 1TB drive!! Also, please buy a 24" with 16GB of RAM, the RAM is NOT upgradeable on 24" iMacs.

From 2012 to present, iMac have a one-piece display assembly. Even if only the glass cover cracks but the rest of the display works, you have to replace the entire assembly.

I checked a site I've used that sells user/pulled parts and their prices always seem represetnative in the US. Their cost for a used assembly for your model is US$340-400 based on condition, and that is just the part. It is not considered a user-serviceable part, so add in one to two hours of labor at an estimated US$75/hour, plus the cost of the reseal kit. That could reach well over US$500.

The most cost-effective option is to live with the crack.

Next most cost-effective is to get an external monitor and use that.

Connect a display to your Mac - Apple Support

It's too old and not worth it. Fixing will cost more than half the price of a base model 24" iMac.

If you are not read to buy just yet, put a piece of clear tape across the corner so no one will get cut.

Why not schedule in-store repair before deciding? The estimate’s free. The 24 inch iMac’s increasingly ripe for replacement with newer models. I would stall on that.

+1

What year model is the 27" iMac and how bad is the crack?

Your welcome.