Apple iMac Retina 5K - 27" - 1 TB Fusion - Silver

It refers to the iMac's stunning 27-inch screen with a resolution of 5120 x 2880 pixels, delivering incredibly sharp text and vibrant, lifelike images far beyond standard HD displays.

Yes, for this 27-inch iMac model, the RAM is typically user-upgradable. There is a small door on the back of the computer that provides access to the memory slots, allowing you to install additional or larger capacity RAM modules.

A Fusion Drive is a hybrid storage solution that combines a small, fast solid-state drive (SSD) with a larger traditional hard disk drive (HDD). macOS automatically stores frequently used files and applications on the faster SSD, while less-used data resides on the HDD, offering a balance of speed and storage capacity.

'Silver Grade Refurbished' indicates that the product has undergone professional inspection and restoration to full working order. It may show minor cosmetic imperfections, such as light scratches or scuffs on the casing, but its functionality is guaranteed.

Yes, you can update macOS Big Sur to newer supported versions of macOS like Monterey or Ventura, and potentially Sonoma, depending on the specific model year. Always check Apple's compatibility list for your specific iMac model before upgrading.

Yes, the standard Apple Keyboard and Mouse typically included with these iMac models are wireless, connecting via Bluetooth for a clean, cable-free desktop experience.

Ensure the power cable is securely plugged into both the iMac and a working power outlet. Try a different outlet if necessary. Confirm the power button on the back is pressed.

Check your storage space; a full drive can slow things down. Close unnecessary applications. Consider restarting the iMac. For persistent slowness, ensure your macOS is updated to the latest supported version and clear browser caches.

Make sure Bluetooth is enabled in `System Preferences` > `Bluetooth`. Try turning Bluetooth off and on again. Restart the iMac. If the issue persists, reset your Mac's PRAM/NVRAM (instructions available on Apple Support).

Restart your iMac. Check `System Preferences` > `Displays` for correct resolution settings. A diagnostic test may be needed if the problem persists.