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Hi, just purchased iMac second hand and it’s loading up to a white screen with prohibited sign. I read some articles and as I could understand I need to hold the Command button and R to reboot, but the computer is not detecting the keyboard as well. Please advise what I could do. Thanks in advance. Attaching a photo as well
I strongly suspect the computer was also not prepared per the directions in What to do before you sell, give away, or trade in your Mac. My recommendation is to return it and get your money back!!!!!!!!!! If the computer was not setup per the link's directions, what you have is a computer that will be permanently associated with the previous owner, not good at all. If you do not want to buy a new Mac then please buy an Apple refurbished Mac. You can find these at Apple.com, look on the bottom of the page for the Refurbished store. There is NOT downside to these machines, they are identical to new, have same warranty as new and are eligible for AppleCare AND can save hundreds of $$$.
If that does not work for you, then buy a used Mac from a reputable reseller such as Macsales.com. NEVER EVER buy a used Mac from:
Why, because most are not setup correctly for sale and you often are inheriting someone else's problems.
Sorry this has happened to you and hopefully you have very little time and money invested.
It seems that your OS is damaged, and booting into recovery mode and reinstalling MacOS should help fix it
Use macOS Recovery on an Intel-based Mac - Apple Support
In some cases, the recovery partition (which is what recovery mode boots into), can be also be damaged. If your recovery partition is damaged, you can use a portable drive to create a MacOS installation image
If your Mac starts up to a circle with a line through it - Apple Support
What keyboard are you trying to use and how is it connected?
iMac is starting with prohibited sign
