Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
Perhaps you need to clean the contacts on the lens mount of the camera body,
and also the contacts on the lens mount of the lens assembly, corresponding to the previous contacts on the camera body.
Cleaning should be done gently (so as to avoid rubbing off the rather thin coating on the contacts) by rubbing slightly with a clean dry soft cloth.
Then re-mount the lens assembly, and try turning On the camera again.
Let me know how it goes, in Reply To Expert, please. Thanks.
Please tell me more about
"obviously no connection to the lens anymore"
and if so, what error message is on the camera's sceen.
I have to admit that sounds bad, I'm sorry to say.
I need to ask a few questions about the camera and its history, please:
How old is the camera? in months or years since you bought it.
Has the camera been dropped or otherwise subjected to mechanical shock(s) in its lifetime?
Has the camera been operated in or subjected to, temperatures below 32 degrees F (freezing point) or above about 100 degrees F ?
Has it ever been subjected to a humidity higher than 85 % or gotten wet ?
Has the camera been operated in a gritty or sandy environment, such as a beach, a seaside, a construction site, or the like?
How old are the batteries now being used in the camera?
How old is the camera itself, measured from its date of purchase, please?
I admit I have no more to suggest to help with this case, I'm sorry to say.
I have Opted Out, opening the case to other Experts in this category, at no additional charge to you. A second opinion from another Expert here may or may not be coming along shortly... if and when another Expert takes up the case, you ought to receive a notification email.
Thank you for your patience, and for asking your question here at JustAnswer.com.