Small problems 5K

I don't know if it's a run of bad units. I got mine on Tuesday and have had the same or simular issue.

I have a second display hooked up through a display port cable. When using the iMac, periodically both screens go black as if it's dumping itself into sleep mode. It will stay like that until you hit the enter key on the keyboard. When the screens comes back to life, the background is sometimes changed and the dock has moved from the main 27" monitor to the secondary.

If you let the machine go to sleep, or enable the screen sleep hot corner and let the unit sleep for more than 20 minutes, it will never wake. Even a forced reset (hold the power button) will not wake it. The only option is to pull the power plug.

I spent 2 hours on the phone with apple and was determined the unit is DOA and is getting replaced. I would suggest that you follow up with apple and get the unit replaced. It clearly should not be doing what it is doing.

Definitely not normal. Try re-seating the memory modules. They could have come loose during shipment.

50L said:

I did this already because ive upgraded my ram yesterday with owc

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You probably should have mentioned that in your original post. Bad memory modules will cause crashing and/or freezing. Try putting the original RAM back in and see if it runs normally.

If it does get OWC to replace the RAM. Otherwise, get Apple to replace the iMac as something else must be wrong.

We had one 5k suffer from heat issues then stopped booting properly. New unit on the way supposedly.
No reason to fool around with it. Call Apple and get a new one, period

50L said:

I bought this machine from a webshop ( no official apple retailer), it's 600km from my house. If I claim a DOA, who is going to pay the shipping costs?me? or apple?

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My guess would be you.