IMac 9.1 Intel core 2 duo 2.66 GHz processor Upgraded to 8 Gb memory Wiped of all data including macOS, ready for your installl with new Apple user ID. Originally I believe this was MacOS Lion, which is free now to download from Apple store, and I had upgraded it as far as possible to MacOS X snow leopard. If you can not get it working you are free to return, for money back, or recycle it. Before wiping it the only issue is Safari security certificates sometimes return an error, but worked well for all other Mac functions.